[PATCH 19/19] drivers: sg chaining support

From: Jens Axboe
Date: Wed May 16 2007 - 04:43:15 EST

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In reply to: Jens Axboe: "[PATCH 17/19] SCSI: support for allocating large scatterlists"
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This converts SCSI/IDE/etc drivers to sg chaining support. The
patches exist as seperate entities in the #sglist branch of the
block git repo, but collated here to avoid a huge thread.

Signed-off-by: Jens Axboe <jens.axboe@xxxxxxxxxx>

diff --git a/arch/ia64/hp/sim/simscsi.c b/arch/ia64/hp/sim/simscsi.c
index bb87682..291e7f4 100644
--- a/arch/ia64/hp/sim/simscsi.c
+++ b/arch/ia64/hp/sim/simscsi.c
@@ -173,7 +173,7 @@ simscsi_sg_readwrite (struct scsi_cmnd *sc, int mode, unsigned long offset)
return;
}
offset += sl->length;
- sl++;
+ sl = sg_next(sl);
list_len--;
}
sc->result = GOOD;
@@ -239,18 +239,23 @@ simscsi_readwrite10 (struct scsi_cmnd *sc, int mode)
static void simscsi_fillresult(struct scsi_cmnd *sc, char *buf, unsigned len)
{

- int scatterlen = sc->use_sg;
- struct scatterlist *slp;
+ int scatterlen = sc->use_sg, i;
+ struct scatterlist *slp, *sg;

if (scatterlen == 0)
memcpy(sc->request_buffer, buf, len);
- else for (slp = (struct scatterlist *)sc->request_buffer;
- scatterlen-- > 0 && len > 0; slp++) {
- unsigned thislen = min(len, slp->length);
+ else {
+ slp = sc->request_buffer;
+ for_each_sg(slp, sg, scatterlen, i) {
+ unsigned thislen;

- memcpy(page_address(slp->page) + slp->offset, buf, thislen);
- slp++;
- len -= thislen;
+ if (len <= 0)
+ break;
+
+ thislen = min(len, slp->length);
+ memcpy(page_address(sg->page) + sg->offset, buf, thislen);
+ len -= thislen;
+ }
}
}

diff --git a/drivers/ide/cris/ide-cris.c b/drivers/ide/cris/ide-cris.c
index ca0341c..3565c76 100644
--- a/drivers/ide/cris/ide-cris.c
+++ b/drivers/ide/cris/ide-cris.c
@@ -951,7 +951,8 @@ static int cris_ide_build_dmatable (ide_drive_t *drive)
/* group sequential buffers into one large buffer */
addr = page_to_phys(sg->page) + sg->offset;
size = sg_dma_len(sg);
- while (sg++, --i) {
+ while (--i) {
+ sg = sg_next(sg);
if ((addr + size) != page_to_phys(sg->page) + sg->offset)
break;
size += sg_dma_len(sg);
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index b77b7d1..aa13309 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -292,7 +292,7 @@ int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
}
}

- sg++;
+ sg = sg_next(sg);
i--;
}

diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 30175c7..412ba5e 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -259,6 +259,7 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
+ struct scatterlist *cursg = hwif->cursg;
struct page *page;
#ifdef CONFIG_HIGHMEM
unsigned long flags;
@@ -266,8 +267,14 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
unsigned int offset;
u8 *buf;

- page = sg[hwif->cursg].page;
- offset = sg[hwif->cursg].offset + hwif->cursg_ofs * SECTOR_SIZE;
+ cursg = hwif->cursg;
+ if (!cursg) {
+ cursg = sg;
+ hwif->cursg = sg;
+ }
+
+ page = cursg->page;
+ offset = cursg->offset + hwif->cursg_ofs * SECTOR_SIZE;

/* get the current page and offset */
page = nth_page(page, (offset >> PAGE_SHIFT));
@@ -281,8 +288,8 @@ static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
hwif->nleft--;
hwif->cursg_ofs++;

- if ((hwif->cursg_ofs * SECTOR_SIZE) == sg[hwif->cursg].length) {
- hwif->cursg++;
+ if ((hwif->cursg_ofs * SECTOR_SIZE) == cursg->length) {
+ hwif->cursg = sg_next(hwif->cursg);
hwif->cursg_ofs = 0;
}

@@ -363,6 +370,8 @@ static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,

static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
{
+ HWIF(drive)->cursg = NULL;
+
if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
ide_task_t *task = rq->special;

diff --git a/drivers/ide/mips/au1xxx-ide.c b/drivers/ide/mips/au1xxx-ide.c
index ca95e99..35b0d1e 100644
--- a/drivers/ide/mips/au1xxx-ide.c
+++ b/drivers/ide/mips/au1xxx-ide.c
@@ -324,7 +324,7 @@ static int auide_build_dmatable(ide_drive_t *drive)
cur_addr += tc;
cur_len -= tc;
}
- sg++;
+ sg = sg_next(sg);
i--;
}

diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
index d3185e2..511e734 100644
--- a/drivers/ide/pci/sgiioc4.c
+++ b/drivers/ide/pci/sgiioc4.c
@@ -531,7 +531,7 @@ sgiioc4_build_dma_table(ide_drive_t * drive, struct request *rq, int ddir)
}
}

- sg++;
+ sg = sg_next(sg);
i--;
}

diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index 45fc36f..2a7555d 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -1648,7 +1648,7 @@ pmac_ide_build_dmatable(ide_drive_t *drive, struct request *rq)
cur_len -= tc;
++table;
}
- sg++;
+ sg = sg_next(sg);
i--;
}

diff --git a/drivers/infiniband/hw/ipath/ipath_dma.c b/drivers/infiniband/hw/ipath/ipath_dma.c
index f87f003..62c87e6 100644
--- a/drivers/infiniband/hw/ipath/ipath_dma.c
+++ b/drivers/infiniband/hw/ipath/ipath_dma.c
@@ -96,17 +96,18 @@ static void ipath_dma_unmap_page(struct ib_device *dev,
BUG_ON(!valid_dma_direction(direction));
}

-static int ipath_map_sg(struct ib_device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction direction)
+static int ipath_map_sg(struct ib_device *dev, struct scatterlist *sgl,
+ int nents, enum dma_data_direction direction)
{
+ struct scatterlist *sg;
u64 addr;
int i;
int ret = nents;

BUG_ON(!valid_dma_direction(direction));

- for (i = 0; i < nents; i++) {
- addr = (u64) page_address(sg[i].page);
+ for_each_sg(sgl, sg, nents, i) {
+ addr = (u64) page_address(sg->page);
/* TODO: handle highmem pages */
if (!addr) {
ret = 0;
diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c
index fc9f1fd..ff0c701 100644
--- a/drivers/infiniband/ulp/iser/iser_memory.c
+++ b/drivers/infiniband/ulp/iser/iser_memory.c
@@ -37,7 +37,6 @@
#include <linux/mm.h>
#include <linux/highmem.h>
#include <asm/io.h>
-#include <asm/scatterlist.h>
#include <linux/scatterlist.h>

#include "iscsi_iser.h"
@@ -126,17 +125,19 @@ int iser_start_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,

if (cmd_dir == ISER_DIR_OUT) {
/* copy the unaligned sg the buffer which is used for RDMA */
- struct scatterlist *sg = (struct scatterlist *)data->buf;
+ struct scatterlist *sgl = (struct scatterlist *)data->buf;
+ struct scatterlist *sg;
int i;
char *p, *from;

- for (p = mem, i = 0; i < data->size; i++) {
- from = kmap_atomic(sg[i].page, KM_USER0);
+ p = mem;
+ for_each_sg(sgl, sg, data->size, i) {
+ from = kmap_atomic(sg->page, KM_USER0);
memcpy(p,
- from + sg[i].offset,
- sg[i].length);
+ from + sg->offset,
+ sg->length);
kunmap_atomic(from, KM_USER0);
- p += sg[i].length;
+ p += sg->length;
}
}

@@ -178,7 +179,7 @@ void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,

if (cmd_dir == ISER_DIR_IN) {
char *mem;
- struct scatterlist *sg;
+ struct scatterlist *sgl, *sg;
unsigned char *p, *to;
unsigned int sg_size;
int i;
@@ -186,16 +187,17 @@ void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,
/* copy back read RDMA to unaligned sg */
mem = mem_copy->copy_buf;

- sg = (struct scatterlist *)iser_ctask->data[ISER_DIR_IN].buf;
+ sgl = (struct scatterlist *)iser_ctask->data[ISER_DIR_IN].buf;
sg_size = iser_ctask->data[ISER_DIR_IN].size;

- for (p = mem, i = 0; i < sg_size; i++){
- to = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
- memcpy(to + sg[i].offset,
+ p = mem;
+ for_each_sg(sgl, sg, sg_size, i) {
+ to = kmap_atomic(sg->page, KM_SOFTIRQ0);
+ memcpy(to + sg->offset,
p,
- sg[i].length);
+ sg->length);
kunmap_atomic(to, KM_SOFTIRQ0);
- p += sg[i].length;
+ p += sg->length;
}
}

@@ -226,7 +228,8 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
struct iser_page_vec *page_vec,
struct ib_device *ibdev)
{
- struct scatterlist *sg = (struct scatterlist *)data->buf;
+ struct scatterlist *sgl = (struct scatterlist *)data->buf;
+ struct scatterlist *sg;
u64 first_addr, last_addr, page;
int end_aligned;
unsigned int cur_page = 0;
@@ -234,14 +237,14 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
int i;

/* compute the offset of first element */
- page_vec->offset = (u64) sg[0].offset & ~MASK_4K;
+ page_vec->offset = (u64) sgl[0].offset & ~MASK_4K;

- for (i = 0; i < data->dma_nents; i++) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, &sg[i]);
+ for_each_sg(sgl, sg, data->dma_nents, i) {
+ unsigned int dma_len = ib_sg_dma_len(ibdev, sg);

total_sz += dma_len;

- first_addr = ib_sg_dma_address(ibdev, &sg[i]);
+ first_addr = ib_sg_dma_address(ibdev, sg);
last_addr = first_addr + dma_len;

end_aligned = !(last_addr & ~MASK_4K);
@@ -249,9 +252,9 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
/* continue to collect page fragments till aligned or SG ends */
while (!end_aligned && (i + 1 < data->dma_nents)) {
i++;
- dma_len = ib_sg_dma_len(ibdev, &sg[i]);
+ dma_len = ib_sg_dma_len(ibdev, sg);
total_sz += dma_len;
- last_addr = ib_sg_dma_address(ibdev, &sg[i]) + dma_len;
+ last_addr = ib_sg_dma_address(ibdev, sg) + dma_len;
end_aligned = !(last_addr & ~MASK_4K);
}

@@ -286,25 +289,26 @@ static int iser_sg_to_page_vec(struct iser_data_buf *data,
static unsigned int iser_data_buf_aligned_len(struct iser_data_buf *data,
struct ib_device *ibdev)
{
- struct scatterlist *sg;
+ struct scatterlist *sgl, *sg;
u64 end_addr, next_addr;
int i, cnt;
unsigned int ret_len = 0;

- sg = (struct scatterlist *)data->buf;
+ sgl = (struct scatterlist *)data->buf;

- for (cnt = 0, i = 0; i < data->dma_nents; i++, cnt++) {
+ cnt = 0;
+ for_each_sg(sgl, sg, data->dma_nents, i) {
/* iser_dbg("Checking sg iobuf [%d]: phys=0x%08lX "
"offset: %ld sz: %ld\n", i,
- (unsigned long)page_to_phys(sg[i].page),
- (unsigned long)sg[i].offset,
- (unsigned long)sg[i].length); */
- end_addr = ib_sg_dma_address(ibdev, &sg[i]) +
- ib_sg_dma_len(ibdev, &sg[i]);
+ (unsigned long)page_to_phys(sg->page),
+ (unsigned long)sg->offset,
+ (unsigned long)sg->length); */
+ end_addr = ib_sg_dma_address(ibdev, sg) +
+ ib_sg_dma_len(ibdev, sg);
/* iser_dbg("Checking sg iobuf end address "
"0x%08lX\n", end_addr); */
if (i + 1 < data->dma_nents) {
- next_addr = ib_sg_dma_address(ibdev, &sg[i+1]);
+ next_addr = ib_sg_dma_address(ibdev, sg_next(sg));
/* are i, i+1 fragments of the same page? */
if (end_addr == next_addr)
continue;
@@ -324,15 +328,16 @@ static unsigned int iser_data_buf_aligned_len(struct iser_data_buf *data,
static void iser_data_buf_dump(struct iser_data_buf *data,
struct ib_device *ibdev)
{
- struct scatterlist *sg = (struct scatterlist *)data->buf;
+ struct scatterlist *sgl = (struct scatterlist *)data->buf;
+ struct scatterlist *sg;
int i;

- for (i = 0; i < data->dma_nents; i++)
+ for_each_sg(sgl, sg, data->dma_nents, i)
iser_err("sg[%d] dma_addr:0x%lX page:0x%p "
"off:0x%x sz:0x%x dma_len:0x%x\n",
- i, (unsigned long)ib_sg_dma_address(ibdev, &sg[i]),
- sg[i].page, sg[i].offset,
- sg[i].length, ib_sg_dma_len(ibdev, &sg[i]));
+ i, (unsigned long)ib_sg_dma_address(ibdev, sg),
+ sg->page, sg->offset,
+ sg->length, ib_sg_dma_len(ibdev, sg));
}

static void iser_dump_page_vec(struct iser_page_vec *page_vec)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 39bf057..c31d50d 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -595,6 +595,7 @@ static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
int ret;
struct srp_device *dev = target->srp_host->dev;
struct ib_device *ibdev = dev->dev;
+ struct scatterlist *sg;

if (!dev->fmr_pool)
return -ENODEV;
@@ -604,16 +605,16 @@ static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
return -EINVAL;

len = page_cnt = 0;
- for (i = 0; i < sg_cnt; ++i) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]);
+ for_each_sg(scat, sg, sg_cnt, i) {
+ unsigned int dma_len = ib_sg_dma_len(ibdev, sg);

- if (ib_sg_dma_address(ibdev, &scat[i]) & ~dev->fmr_page_mask) {
+ if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
if (i > 0)
return -EINVAL;
else
++page_cnt;
}
- if ((ib_sg_dma_address(ibdev, &scat[i]) + dma_len) &
+ if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
~dev->fmr_page_mask) {
if (i < sg_cnt - 1)
return -EINVAL;
@@ -633,12 +634,12 @@ static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
return -ENOMEM;

page_cnt = 0;
- for (i = 0; i < sg_cnt; ++i) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]);
+ for_each_sg(scat, sg, sg_cnt, i) {
+ unsigned int dma_len = ib_sg_dma_len(ibdev, sg);

for (j = 0; j < dma_len; j += dev->fmr_page_size)
dma_pages[page_cnt++] =
- (ib_sg_dma_address(ibdev, &scat[i]) &
+ (ib_sg_dma_address(ibdev, sg) &
dev->fmr_page_mask) + j;
}

@@ -724,6 +725,7 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
* descriptor.
*/
struct srp_indirect_buf *buf = (void *) cmd->add_data;
+ struct scatterlist *sg;
u32 datalen = 0;
int i;

@@ -732,11 +734,11 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
sizeof (struct srp_indirect_buf) +
count * sizeof (struct srp_direct_buf);

- for (i = 0; i < count; ++i) {
- unsigned int dma_len = ib_sg_dma_len(ibdev, &scat[i]);
+ for_each_sg(scat, sg, count, i) {
+ unsigned int dma_len = ib_sg_dma_len(ibdev, sg);

buf->desc_list[i].va =
- cpu_to_be64(ib_sg_dma_address(ibdev, &scat[i]));
+ cpu_to_be64(ib_sg_dma_address(ibdev, sg));
buf->desc_list[i].key =
cpu_to_be32(dev->mr->rkey);
buf->desc_list[i].len = cpu_to_be32(dma_len);
diff --git a/drivers/message/fusion/mptscsih.c b/drivers/message/fusion/mptscsih.c
index fa0f776..8844167 100644
--- a/drivers/message/fusion/mptscsih.c
+++ b/drivers/message/fusion/mptscsih.c
@@ -315,7 +315,7 @@ nextSGEset:
v2 = sg_dma_address(sg);
mptscsih_add_sge(psge, sgflags | thisxfer, v2);

- sg++; /* Get next SG element from the OS */
+ sg = sg_next(sg); /* Get next SG element from the OS */
psge += (sizeof(u32) + sizeof(dma_addr_t));
sgeOffset += (sizeof(u32) + sizeof(dma_addr_t));
sg_done++;
@@ -336,7 +336,7 @@ nextSGEset:
v2 = sg_dma_address(sg);
mptscsih_add_sge(psge, sgflags | thisxfer, v2);
/*
- sg++;
+ sg = sg_next(sg);
psge += (sizeof(u32) + sizeof(dma_addr_t));
*/
sgeOffset += (sizeof(u32) + sizeof(dma_addr_t));
diff --git a/drivers/scsi/3w-9xxx.c b/drivers/scsi/3w-9xxx.c
index eb766c3..293cfd2 100644
--- a/drivers/scsi/3w-9xxx.c
+++ b/drivers/scsi/3w-9xxx.c
@@ -1815,7 +1815,7 @@ static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
u32 num_sectors = 0x0;
int i, sg_count;
struct scsi_cmnd *srb = NULL;
- struct scatterlist *sglist = NULL;
+ struct scatterlist *sglist = NULL, *sg;
dma_addr_t buffaddr = 0x0;
int retval = 1;

@@ -1893,9 +1893,9 @@ static int twa_scsiop_execute_scsi(TW_Device_Extension *tw_dev, int request_id,
if (sg_count == 0)
goto out;

- for (i = 0; i < sg_count; i++) {
- command_packet->sg_list[i].address = TW_CPU_TO_SGL(sg_dma_address(&sglist[i]));
- command_packet->sg_list[i].length = cpu_to_le32(sg_dma_len(&sglist[i]));
+ for_each_sg(sglist, sg, sg_count, i) {
+ command_packet->sg_list[i].address = TW_CPU_TO_SGL(sg_dma_address(sg));
+ command_packet->sg_list[i].length = cpu_to_le32(sg_dma_len(sg));
if (command_packet->sg_list[i].address & TW_CPU_TO_SGL(TW_ALIGNMENT_9000_SGL)) {
TW_PRINTK(tw_dev->host, TW_DRIVER, 0x2e, "Found unaligned sgl address during execute scsi");
goto out;
diff --git a/drivers/scsi/3w-xxxx.c b/drivers/scsi/3w-xxxx.c
index 656bdb1..3d005cf 100644
--- a/drivers/scsi/3w-xxxx.c
+++ b/drivers/scsi/3w-xxxx.c
@@ -1767,7 +1767,7 @@ static int tw_scsiop_read_write(TW_Device_Extension *tw_dev, int request_id)
u32 lba = 0x0, num_sectors = 0x0, buffaddr = 0x0;
int i, use_sg;
struct scsi_cmnd *srb;
- struct scatterlist *sglist;
+ struct scatterlist *sglist, *sg;

dprintk(KERN_NOTICE "3w-xxxx: tw_scsiop_read_write()\n");

@@ -1837,9 +1837,9 @@ static int tw_scsiop_read_write(TW_Device_Extension *tw_dev, int request_id)
if (use_sg == 0)
return 1;

- for (i=0;i<use_sg; i++) {
- command_packet->byte8.io.sgl[i].address = sg_dma_address(&sglist[i]);
- command_packet->byte8.io.sgl[i].length = sg_dma_len(&sglist[i]);
+ for_each_sg(sglist, sg, use_sg, i) {
+ command_packet->byte8.io.sgl[i].address = sg_dma_address(sg);
+ command_packet->byte8.io.sgl[i].length = sg_dma_len(sg);
command_packet->size+=2;
}
}
diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index cb02656..821163d 100644
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -1887,6 +1887,7 @@ NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
int i;
int sg_count;
dma_addr_t vPtr = 0;
+ struct scatterlist *sgl, *sg;
__u32 count = 0;

if(SCp->use_sg) {
@@ -1902,15 +1903,12 @@ NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
slot->dma_handle = vPtr;
sg_count = 1;
}
-
-
- for(i = 0; i < sg_count; i++) {
-
- if(SCp->use_sg) {
- struct scatterlist *sg = SCp->request_buffer;
-
- vPtr = sg_dma_address(&sg[i]);
- count = sg_dma_len(&sg[i]);
+
+ sgl = SCp->request_buffer;
+ for_each_sg(sgl, sg, sg_count, i) {
+ if (SCp->use_sg) {
+ vPtr = sg_dma_address(sg);
+ count = sg_dma_len(sg);
}

slot->SG[i].ins = bS_to_host(move_ins | count);
diff --git a/drivers/scsi/BusLogic.c b/drivers/scsi/BusLogic.c
index 96f4cab..7fd1cca 100644
--- a/drivers/scsi/BusLogic.c
+++ b/drivers/scsi/BusLogic.c
@@ -2862,6 +2862,7 @@ static int BusLogic_QueueCommand(struct scsi_cmnd *Command, void (*CompletionRou
Command->sc_data_direction);
} else if (SegmentCount != 0) {
struct scatterlist *ScatterList = (struct scatterlist *) BufferPointer;
+ struct scatterlist *sg;
int Segment, Count;

Count = pci_map_sg(HostAdapter->PCI_Device, ScatterList, SegmentCount,
@@ -2872,9 +2873,9 @@ static int BusLogic_QueueCommand(struct scsi_cmnd *Command, void (*CompletionRou
CCB->DataPointer = (unsigned int) CCB->DMA_Handle + ((unsigned long) &CCB->ScatterGatherList - (unsigned long) CCB);
else
CCB->DataPointer = Virtual_to_32Bit_Virtual(CCB->ScatterGatherList);
- for (Segment = 0; Segment < Count; Segment++) {
- CCB->ScatterGatherList[Segment].SegmentByteCount = sg_dma_len(ScatterList + Segment);
- CCB->ScatterGatherList[Segment].SegmentDataPointer = sg_dma_address(ScatterList + Segment);
+ for_each_sg(ScatterList, sg, Count, Segment) {
+ CCB->ScatterGatherList[Segment].SegmentByteCount = sg_dma_len(sg);
+ CCB->ScatterGatherList[Segment].SegmentDataPointer = sg_dma_address(sg);
}
} else {
CCB->Opcode = BusLogic_InitiatorCCB;
diff --git a/drivers/scsi/NCR53c406a.c b/drivers/scsi/NCR53c406a.c
index 7c0b17f..9402dd9 100644
--- a/drivers/scsi/NCR53c406a.c
+++ b/drivers/scsi/NCR53c406a.c
@@ -875,12 +875,13 @@ static void NCR53c406a_intr(void *dev_id)
if (!current_SC->use_sg) /* Don't use scatter-gather */
NCR53c406a_pio_write(current_SC->request_buffer, current_SC->request_bufflen);
else { /* use scatter-gather */
+ struct scatterlist *sg;
+ int i;
+
sgcount = current_SC->use_sg;
sglist = current_SC->request_buffer;
- while (sgcount--) {
- NCR53c406a_pio_write(page_address(sglist->page) + sglist->offset, sglist->length);
- sglist++;
- }
+ for_each_sg(sglist, sg, sgcount, i)
+ NCR53c406a_pio_write(page_address(sg->page) + sg->offset, sg->length);
}
REG0;
#endif /* USE_PIO */
@@ -902,12 +903,13 @@ static void NCR53c406a_intr(void *dev_id)
if (!current_SC->use_sg) /* Don't use scatter-gather */
NCR53c406a_pio_read(current_SC->request_buffer, current_SC->request_bufflen);
else { /* Use scatter-gather */
+ struct scatterlist *sg;
+ int i;
+
sgcount = current_SC->use_sg;
sglist = current_SC->request_buffer;
- while (sgcount--) {
- NCR53c406a_pio_read(page_address(sglist->page) + sglist->offset, sglist->length);
- sglist++;
- }
+ for_each_sg(sglist, sg, sgcount, i)
+ NCR53c406a_pio_read(page_address(sg->page) + sg->offset, sg->length);
}
REG0;
#endif /* USE_PIO */
diff --git a/drivers/scsi/a100u2w.c b/drivers/scsi/a100u2w.c
index 7f4241b..1353900 100644
--- a/drivers/scsi/a100u2w.c
+++ b/drivers/scsi/a100u2w.c
@@ -796,7 +796,7 @@ static void orc_interrupt(
*****************************************************************************/
static void inia100BuildSCB(ORC_HCS * pHCB, ORC_SCB * pSCB, struct scsi_cmnd * SCpnt)
{ /* Create corresponding SCB */
- struct scatterlist *pSrbSG;
+ struct scatterlist *pSrbSG, *sg;
ORC_SG *pSG; /* Pointer to SG list */
int i, count_sg;
ESCB *pEScb;
@@ -820,9 +820,10 @@ static void inia100BuildSCB(ORC_HCS * pHCB, ORC_SCB * pSCB, struct scsi_cmnd * S
count_sg = pci_map_sg(pHCB->pdev, pSrbSG, SCpnt->use_sg,
SCpnt->sc_data_direction);
pSCB->SCB_SGLen = (U32) (count_sg * 8);
- for (i = 0; i < count_sg; i++, pSG++, pSrbSG++) {
- pSG->SG_Ptr = (U32) sg_dma_address(pSrbSG);
- pSG->SG_Len = (U32) sg_dma_len(pSrbSG);
+ for_each_sg(pSrbSG, sg, count_sg, i) {
+ pSG->SG_Ptr = (U32) sg_dma_address(sg);
+ pSG->SG_Len = (U32) sg_dma_len(sg);
+ pSG++;
}
} else if (SCpnt->request_bufflen != 0) {/* Non SG */
pSCB->SCB_SGLen = 0x8;
diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index 1e82c69..7fcac4e 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -2347,7 +2347,7 @@ static unsigned long aac_build_sg(struct scsi_cmnd* scsicmd, struct sgmap* psg)
psg->sg[0].addr = 0;
psg->sg[0].count = 0;
if (scsicmd->use_sg) {
- struct scatterlist *sg;
+ struct scatterlist *sg, *s;
int i;
int sg_count;
sg = (struct scatterlist *) scsicmd->request_buffer;
@@ -2356,11 +2356,10 @@ static unsigned long aac_build_sg(struct scsi_cmnd* scsicmd, struct sgmap* psg)
scsicmd->sc_data_direction);
psg->count = cpu_to_le32(sg_count);

- for (i = 0; i < sg_count; i++) {
- psg->sg[i].addr = cpu_to_le32(sg_dma_address(sg));
- psg->sg[i].count = cpu_to_le32(sg_dma_len(sg));
- byte_count += sg_dma_len(sg);
- sg++;
+ for_each_sg(sg, s, sg_count, i) {
+ psg->sg[i].addr = cpu_to_le32(sg_dma_address(s));
+ psg->sg[i].count = cpu_to_le32(sg_dma_len(s));
+ byte_count += sg_dma_len(s);
}
/* hba wants the size to be exact */
if(byte_count > scsicmd->request_bufflen){
@@ -2404,7 +2403,7 @@ static unsigned long aac_build_sg64(struct scsi_cmnd* scsicmd, struct sgmap64* p
psg->sg[0].addr[1] = 0;
psg->sg[0].count = 0;
if (scsicmd->use_sg) {
- struct scatterlist *sg;
+ struct scatterlist *sg, *s;
int i;
int sg_count;
sg = (struct scatterlist *) scsicmd->request_buffer;
@@ -2412,14 +2411,13 @@ static unsigned long aac_build_sg64(struct scsi_cmnd* scsicmd, struct sgmap64* p
sg_count = pci_map_sg(dev->pdev, sg, scsicmd->use_sg,
scsicmd->sc_data_direction);

- for (i = 0; i < sg_count; i++) {
- int count = sg_dma_len(sg);
- addr = sg_dma_address(sg);
+ for_each_sg(sg, s, sg_count, i) {
+ int count = sg_dma_len(s);
+ addr = sg_dma_address(s);
psg->sg[i].addr[0] = cpu_to_le32(addr & 0xffffffff);
psg->sg[i].addr[1] = cpu_to_le32(addr>>32);
psg->sg[i].count = cpu_to_le32(count);
byte_count += count;
- sg++;
}
psg->count = cpu_to_le32(sg_count);
/* hba wants the size to be exact */
@@ -2465,7 +2463,7 @@ static unsigned long aac_build_sgraw(struct scsi_cmnd* scsicmd, struct sgmapraw*
psg->sg[0].count = 0;
psg->sg[0].flags = 0;
if (scsicmd->use_sg) {
- struct scatterlist *sg;
+ struct scatterlist *sg, *s;
int i;
int sg_count;
sg = (struct scatterlist *) scsicmd->request_buffer;
@@ -2473,9 +2471,9 @@ static unsigned long aac_build_sgraw(struct scsi_cmnd* scsicmd, struct sgmapraw*
sg_count = pci_map_sg(dev->pdev, sg, scsicmd->use_sg,
scsicmd->sc_data_direction);

- for (i = 0; i < sg_count; i++) {
- int count = sg_dma_len(sg);
- u64 addr = sg_dma_address(sg);
+ for_each_sg(sg, s, sg_count, i) {
+ int count = sg_dma_len(s);
+ u64 addr = sg_dma_address(s);
psg->sg[i].next = 0;
psg->sg[i].prev = 0;
psg->sg[i].addr[1] = cpu_to_le32((u32)(addr>>32));
@@ -2483,7 +2481,6 @@ static unsigned long aac_build_sgraw(struct scsi_cmnd* scsicmd, struct sgmapraw*
psg->sg[i].count = cpu_to_le32(count);
psg->sg[i].flags = 0;
byte_count += count;
- sg++;
}
psg->count = cpu_to_le32(sg_count);
/* hba wants the size to be exact */
diff --git a/drivers/scsi/advansys.c b/drivers/scsi/advansys.c
index 9b3303b..06bf40c 100644
--- a/drivers/scsi/advansys.c
+++ b/drivers/scsi/advansys.c
@@ -6468,7 +6468,7 @@ asc_build_req(asc_board_t *boardp, struct scsi_cmnd *scp)
*/
int sgcnt;
int use_sg;
- struct scatterlist *slp;
+ struct scatterlist *slp, *sg;

slp = (struct scatterlist *)scp->request_buffer;
use_sg = dma_map_sg(dev, slp, scp->use_sg, scp->sc_data_direction);
@@ -6502,10 +6502,10 @@ asc_build_req(asc_board_t *boardp, struct scsi_cmnd *scp)
/*
* Convert scatter-gather list into ASC_SG_HEAD list.
*/
- for (sgcnt = 0; sgcnt < use_sg; sgcnt++, slp++) {
- asc_sg_head.sg_list[sgcnt].addr = cpu_to_le32(sg_dma_address(slp));
- asc_sg_head.sg_list[sgcnt].bytes = cpu_to_le32(sg_dma_len(slp));
- ASC_STATS_ADD(scp->device->host, sg_xfer, ASC_CEILING(sg_dma_len(slp), 512));
+ for_each_sg(slp, sg, use_sg, sgcnt) {
+ asc_sg_head.sg_list[sgcnt].addr = cpu_to_le32(sg_dma_address(sg));
+ asc_sg_head.sg_list[sgcnt].bytes = cpu_to_le32(sg_dma_len(sg));
+ ASC_STATS_ADD(scp->device->host, sg_xfer, ASC_CEILING(sg_dma_len(sg), 512));
}
}

@@ -6700,7 +6700,7 @@ adv_get_sglist(asc_board_t *boardp, adv_req_t *reqp, struct scsi_cmnd *scp, int
{
adv_sgblk_t *sgblkp;
ADV_SCSI_REQ_Q *scsiqp;
- struct scatterlist *slp;
+ struct scatterlist *slp, *sg;
int sg_elem_cnt;
ADV_SG_BLOCK *sg_block, *prev_sg_block;
ADV_PADDR sg_block_paddr;
@@ -6778,11 +6778,11 @@ adv_get_sglist(asc_board_t *boardp, adv_req_t *reqp, struct scsi_cmnd *scp, int
}
}

- for (i = 0; i < NO_OF_SG_PER_BLOCK; i++)
+ for_each_sg(slp, sg, NO_OF_SG_PER_BLOCK, i)
{
- sg_block->sg_list[i].sg_addr = cpu_to_le32(sg_dma_address(slp));
- sg_block->sg_list[i].sg_count = cpu_to_le32(sg_dma_len(slp));
- ASC_STATS_ADD(scp->device->host, sg_xfer, ASC_CEILING(sg_dma_len(slp), 512));
+ sg_block->sg_list[i].sg_addr = cpu_to_le32(sg_dma_address(sg));
+ sg_block->sg_list[i].sg_count = cpu_to_le32(sg_dma_len(sg));
+ ASC_STATS_ADD(scp->device->host, sg_xfer, ASC_CEILING(sg_dma_len(sg), 512));

if (--sg_elem_cnt == 0)
{ /* Last ADV_SG_BLOCK and scatter-gather entry. */
@@ -6790,7 +6790,6 @@ adv_get_sglist(asc_board_t *boardp, adv_req_t *reqp, struct scsi_cmnd *scp, int
sg_block->sg_ptr = 0L; /* Last ADV_SG_BLOCK in list. */
return ADV_SUCCESS;
}
- slp++;
}
sg_block->sg_cnt = NO_OF_SG_PER_BLOCK;
prev_sg_block = sg_block;
diff --git a/drivers/scsi/aha1542.c b/drivers/scsi/aha1542.c
index cbbfbc9..0a4d34b 100644
--- a/drivers/scsi/aha1542.c
+++ b/drivers/scsi/aha1542.c
@@ -691,7 +691,7 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
memcpy(ccb[mbo].cdb, cmd, ccb[mbo].cdblen);

if (SCpnt->use_sg) {
- struct scatterlist *sgpnt;
+ struct scatterlist *sgpnt, *sg;
struct chain *cptr;
#ifdef DEBUG
unsigned char *ptr;
@@ -706,16 +706,15 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
HOSTDATA(SCpnt->device->host)->SCint[mbo] = NULL;
return SCSI_MLQUEUE_HOST_BUSY;
}
- for (i = 0; i < SCpnt->use_sg; i++) {
- if (sgpnt[i].length == 0 || SCpnt->use_sg > 16 ||
- (((int) sgpnt[i].offset) & 1) || (sgpnt[i].length & 1)) {
+ for_each_sg(sgpnt, sg, SCpnt->use_sg, i) {
+ if (sg->length == 0 || SCpnt->use_sg > 16 ||
+ (((int) sg->offset) & 1) || (sg->length & 1)) {
unsigned char *ptr;
printk(KERN_CRIT "Bad segment list supplied to aha1542.c (%d, %d)\n", SCpnt->use_sg, i);
- for (i = 0; i < SCpnt->use_sg; i++) {
+ for_each_sg(sgpnt, sg, SCpnt->use_sg, i) {
printk(KERN_CRIT "%d: %p %d\n", i,
- (page_address(sgpnt[i].page) +
- sgpnt[i].offset),
- sgpnt[i].length);
+ (page_address(sg->page) +
+ sg->offset), sg->length);
};
printk(KERN_CRIT "cptr %x: ", (unsigned int) cptr);
ptr = (unsigned char *) &cptr[i];
@@ -723,10 +722,10 @@ static int aha1542_queuecommand(Scsi_Cmnd * SCpnt, void (*done) (Scsi_Cmnd *))
printk("%02x ", ptr[i]);
panic("Foooooooood fight!");
};
- any2scsi(cptr[i].dataptr, SCSI_SG_PA(&sgpnt[i]));
- if (SCSI_SG_PA(&sgpnt[i]) + sgpnt[i].length - 1 > ISA_DMA_THRESHOLD)
+ any2scsi(cptr[i].dataptr, SCSI_SG_PA(sg));
+ if (SCSI_SG_PA(sg) + sg->length - 1 > ISA_DMA_THRESHOLD)
BAD_SG_DMA(SCpnt, sgpnt, SCpnt->use_sg, i);
- any2scsi(cptr[i].datalen, sgpnt[i].length);
+ any2scsi(cptr[i].datalen, sg->length);
};
any2scsi(ccb[mbo].datalen, SCpnt->use_sg * sizeof(struct chain));
any2scsi(ccb[mbo].dataptr, SCSI_BUF_PA(cptr));
diff --git a/drivers/scsi/aha1740.c b/drivers/scsi/aha1740.c
index d7af9c6..2641c24 100644
--- a/drivers/scsi/aha1740.c
+++ b/drivers/scsi/aha1740.c
@@ -425,7 +425,7 @@ static int aha1740_queuecommand(Scsi_Cmnd * SCpnt, void (*done)(Scsi_Cmnd *))
sgptr->sg_dma_addr = sg_dma;

if (SCpnt->use_sg) {
- struct scatterlist * sgpnt;
+ struct scatterlist * sgpnt, * sg;
struct aha1740_chain * cptr;
int i, count;
DEB(unsigned char * ptr);
@@ -436,9 +436,9 @@ static int aha1740_queuecommand(Scsi_Cmnd * SCpnt, void (*done)(Scsi_Cmnd *))
cptr = sgptr->sg_chain;
count = dma_map_sg (&host->edev->dev, sgpnt, SCpnt->use_sg,
SCpnt->sc_data_direction);
- for(i=0; i < count; i++) {
- cptr[i].datalen = sg_dma_len (sgpnt + i);
- cptr[i].dataptr = sg_dma_address (sgpnt + i);
+ for_each_sg(sgpnt, sg, count, i) {
+ cptr[i].datalen = sg_dma_len (sg);
+ cptr[i].dataptr = sg_dma_address (sg);
}
host->ecb[ecbno].datalen = count*sizeof(struct aha1740_chain);
host->ecb[ecbno].dataptr = sg_dma;
diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index 6054881..e7ab15b 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -1505,7 +1505,7 @@ ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
nseg = pci_map_sg(ahd->dev_softc, cur_seg,
cmd->use_sg, dir);
scb->platform_data->xfer_len = 0;
- for (sg = scb->sg_list; nseg > 0; nseg--, cur_seg++) {
+ for (sg = scb->sg_list; nseg > 0; nseg--) {
dma_addr_t addr;
bus_size_t len;

@@ -1514,6 +1514,7 @@ ahd_linux_run_command(struct ahd_softc *ahd, struct ahd_linux_device *dev,
scb->platform_data->xfer_len += len;
sg = ahd_sg_setup(ahd, scb, sg, addr, len,
/*last*/nseg == 1);
+ cur_seg = sg_next(cur_seg);
}
} else if (cmd->request_bufflen != 0) {
void *sg;
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index 660f26e..bf85297 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -1475,20 +1475,19 @@ ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
if (cmd->use_sg != 0) {
struct ahc_dma_seg *sg;
struct scatterlist *cur_seg;
- struct scatterlist *end_seg;
- int nseg;
+ struct scatterlist *sgl;
+ int nseg, i;

- cur_seg = (struct scatterlist *)cmd->request_buffer;
- nseg = pci_map_sg(ahc->dev_softc, cur_seg, cmd->use_sg,
+ sgl = (struct scatterlist *)cmd->request_buffer;
+ nseg = pci_map_sg(ahc->dev_softc, sgl, cmd->use_sg,
cmd->sc_data_direction);
- end_seg = cur_seg + nseg;
/* Copy the segments into the SG list. */
sg = scb->sg_list;
/*
* The sg_count may be larger than nseg if
* a transfer crosses a 32bit page.
*/
- while (cur_seg < end_seg) {
+ for_each_sg(sgl, cur_seg, nseg, i) {
dma_addr_t addr;
bus_size_t len;
int consumed;
@@ -1499,7 +1498,6 @@ ahc_linux_run_command(struct ahc_softc *ahc, struct ahc_linux_device *dev,
sg, addr, len);
sg += consumed;
scb->sg_count += consumed;
- cur_seg++;
}
sg--;
sg->len |= ahc_htole32(AHC_DMA_LAST_SEG);
diff --git a/drivers/scsi/aic94xx/aic94xx_task.c b/drivers/scsi/aic94xx/aic94xx_task.c
index e2ad5be..1327281 100644
--- a/drivers/scsi/aic94xx/aic94xx_task.c
+++ b/drivers/scsi/aic94xx/aic94xx_task.c
@@ -89,7 +89,7 @@ static inline int asd_map_scatterlist(struct sas_task *task,
res = -ENOMEM;
goto err_unmap;
}
- for (sc = task->scatter, i = 0; i < num_sg; i++, sc++) {
+ for_each_sg(task->scatter, sc, num_sg, i) {
struct sg_el *sg =
&((struct sg_el *)ascb->sg_arr->vaddr)[i];
sg->bus_addr = cpu_to_le64((u64)sg_dma_address(sc));
@@ -98,7 +98,7 @@ static inline int asd_map_scatterlist(struct sas_task *task,
sg->flags |= ASD_SG_EL_LIST_EOL;
}

- for (sc = task->scatter, i = 0; i < 2; i++, sc++) {
+ for_each_sg(task->scatter, sc, 2, i) {
sg_arr[i].bus_addr =
cpu_to_le64((u64)sg_dma_address(sc));
sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
@@ -110,7 +110,7 @@ static inline int asd_map_scatterlist(struct sas_task *task,
sg_arr[2].bus_addr=cpu_to_le64((u64)ascb->sg_arr->dma_handle);
} else {
int i;
- for (sc = task->scatter, i = 0; i < num_sg; i++, sc++) {
+ for_each_sg(task->scatter, sc, num_sg, i) {
sg_arr[i].bus_addr =
cpu_to_le64((u64)sg_dma_address(sc));
sg_arr[i].size = cpu_to_le32((u32)sg_dma_len(sc));
diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
index 8b46158..c2e2e95 100644
--- a/drivers/scsi/arcmsr/arcmsr_hba.c
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -563,18 +563,18 @@ static void arcmsr_build_ccb(struct AdapterControlBlock *acb,
memcpy(arcmsr_cdb->Cdb, pcmd->cmnd, pcmd->cmd_len);
if (pcmd->use_sg) {
int length, sgcount, i, cdb_sgcount = 0;
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;

/* Get Scatter Gather List from scsiport. */
sl = (struct scatterlist *) pcmd->request_buffer;
sgcount = pci_map_sg(acb->pdev, sl, pcmd->use_sg,
pcmd->sc_data_direction);
/* map stor port SG list to our iop SG List. */
- for (i = 0; i < sgcount; i++) {
+ for_each_sg(sl, sg, sgcount, i) {
/* Get the physical address of the current data pointer */
- length = cpu_to_le32(sg_dma_len(sl));
- address_lo = cpu_to_le32(dma_addr_lo32(sg_dma_address(sl)));
- address_hi = cpu_to_le32(dma_addr_hi32(sg_dma_address(sl)));
+ length = cpu_to_le32(sg_dma_len(sg));
+ address_lo = cpu_to_le32(dma_addr_lo32(sg_dma_address(sg)));
+ address_hi = cpu_to_le32(dma_addr_hi32(sg_dma_address(sg)));
if (address_hi == 0) {
struct SG32ENTRY *pdma_sg = (struct SG32ENTRY *)psge;

@@ -591,7 +591,6 @@ static void arcmsr_build_ccb(struct AdapterControlBlock *acb,
psge += sizeof (struct SG64ENTRY);
arccdbsize += sizeof (struct SG64ENTRY);
}
- sl++;
cdb_sgcount++;
}
arcmsr_cdb->sgcount = (uint8_t)cdb_sgcount;
diff --git a/drivers/scsi/dc395x.c b/drivers/scsi/dc395x.c
index 564ea90..4e0f073 100644
--- a/drivers/scsi/dc395x.c
+++ b/drivers/scsi/dc395x.c
@@ -1010,6 +1010,7 @@ static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
u32 reqlen = cmd->request_bufflen;
struct scatterlist *sl = (struct scatterlist *)
cmd->request_buffer;
+ struct scatterlist *sg;
struct SGentry *sgp = srb->segment_x;
srb->sg_count = pci_map_sg(dcb->acb->dev, sl, cmd->use_sg,
dir);
@@ -1018,9 +1019,9 @@ static void build_srb(struct scsi_cmnd *cmd, struct DeviceCtlBlk *dcb,
reqlen, cmd->request_buffer, cmd->use_sg,
srb->sg_count);

- for (i = 0; i < srb->sg_count; i++) {
- u32 busaddr = (u32)sg_dma_address(&sl[i]);
- u32 seglen = (u32)sl[i].length;
+ for_each_sg(sl, sg, srb->sg_count, i) {
+ u32 busaddr = (u32)sg_dma_address(sg);
+ u32 seglen = (u32)sg->length;
sgp[i].address = busaddr;
sgp[i].length = seglen;
srb->total_xfer_length += seglen;
diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index 8c7d2bb..b63d4b2 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -2141,20 +2141,21 @@ static s32 adpt_scsi_to_i2o(adpt_hba* pHba, struct scsi_cmnd* cmd, struct adpt_d
reqlen = 14; // SINGLE SGE
/* Now fill in the SGList and command */
if(cmd->use_sg) {
- struct scatterlist *sg = (struct scatterlist *)cmd->request_buffer;
- int sg_count = pci_map_sg(pHba->pDev, sg, cmd->use_sg,
+ struct scatterlist *sgl = (struct scatterlist *)cmd->request_buffer;
+ struct scatterlist *sg;
+ int sg_count = pci_map_sg(pHba->pDev, sgl, cmd->use_sg,
cmd->sc_data_direction);

len = 0;
- for(i = 0 ; i < sg_count; i++) {
+ for_each_sg(sgl, sg, sg_count, i) {
*mptr++ = direction|0x10000000|sg_dma_len(sg);
len+=sg_dma_len(sg);
*mptr++ = sg_dma_address(sg);
- sg++;
+ /* Make this an end of list */
+ if (i == sg_count - 1)
+ mptr[-2] = direction|0xD0000000|sg_dma_len(sg);
}
- /* Make this an end of list */
- mptr[-2] = direction|0xD0000000|sg_dma_len(sg-1);
reqlen = mptr - msg;
*lenptr = len;

diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index 2d38025..9526fa9 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -1610,7 +1610,7 @@ static int eata2x_detect(struct scsi_host_template *tpnt)
static void map_dma(unsigned int i, struct hostdata *ha)
{
unsigned int k, count, pci_dir;
- struct scatterlist *sgpnt;
+ struct scatterlist *sgpnt, *sg;
struct mscp *cpp;
struct scsi_cmnd *SCpnt;

@@ -1646,9 +1646,9 @@ static void map_dma(unsigned int i, struct hostdata *ha)
sgpnt = (struct scatterlist *)SCpnt->request_buffer;
count = pci_map_sg(ha->pdev, sgpnt, SCpnt->use_sg, pci_dir);

- for (k = 0; k < count; k++) {
- cpp->sglist[k].address = H2DEV(sg_dma_address(&sgpnt[k]));
- cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(&sgpnt[k]));
+ for_each_sg(sgpnt, sg, count, k) {
+ cpp->sglist[k].address = H2DEV(sg_dma_address(sg));
+ cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(sg));
}

cpp->sg = 1;
diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c
index ec71061..4c29d29 100644
--- a/drivers/scsi/esp_scsi.c
+++ b/drivers/scsi/esp_scsi.c
@@ -325,6 +325,7 @@ static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
{
struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
struct scatterlist *sg = cmd->request_buffer;
+ struct scatterlist *s;
int dir = cmd->sc_data_direction;
int total, i;

@@ -339,8 +340,8 @@ static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
spriv->cur_sg = sg;

total = 0;
- for (i = 0; i < spriv->u.num_sg; i++)
- total += sg_dma_len(&sg[i]);
+ for_each_sg(sg, s, spriv->u.num_sg, i)
+ total += sg_dma_len(s);
spriv->tot_residue = total;
}

diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index 60446b8..3efc084 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -2656,7 +2656,7 @@ static void gdth_copy_internal_data(int hanum,Scsi_Cmnd *scp,
{
ushort cpcount,i;
ushort cpsum,cpnow;
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;
gdth_ha_str *ha;
char *address;

@@ -2665,29 +2665,30 @@ static void gdth_copy_internal_data(int hanum,Scsi_Cmnd *scp,

if (scp->use_sg) {
sl = (struct scatterlist *)scp->request_buffer;
- for (i=0,cpsum=0; i<scp->use_sg; ++i,++sl) {
+ cpsum = 0;
+ for_each_sg(sl, sg, scp->use_sg, i) {
unsigned long flags;
- cpnow = (ushort)sl->length;
+ cpnow = (ushort)sg->length;
TRACE(("copy_internal() now %d sum %d count %d %d\n",
cpnow,cpsum,cpcount,(ushort)scp->bufflen));
if (cpsum+cpnow > cpcount)
cpnow = cpcount - cpsum;
cpsum += cpnow;
- if (!sl->page) {
+ if (!sg->page) {
printk("GDT-HA %d: invalid sc/gt element in gdth_copy_internal_data()\n",
hanum);
return;
}
local_irq_save(flags);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
- address = kmap_atomic(sl->page, KM_BIO_SRC_IRQ) + sl->offset;
+ address = kmap_atomic(sg->page, KM_BIO_SRC_IRQ) + sg->offset;
memcpy(address,buffer,cpnow);
- flush_dcache_page(sl->page);
+ flush_dcache_page(sg->page);
kunmap_atomic(address, KM_BIO_SRC_IRQ);
#else
- address = kmap_atomic(sl->page, KM_BH_IRQ) + sl->offset;
+ address = kmap_atomic(sg->page, KM_BH_IRQ) + sg->offset;
memcpy(address,buffer,cpnow);
- flush_dcache_page(sl->page);
+ flush_dcache_page(sg->page);
kunmap_atomic(address, KM_BH_IRQ);
#endif
local_irq_restore(flags);
@@ -2807,7 +2808,7 @@ static int gdth_fill_cache_cmd(int hanum,Scsi_Cmnd *scp,ushort hdrive)
{
register gdth_ha_str *ha;
register gdth_cmd_str *cmdp;
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;
ulong32 cnt, blockcnt;
ulong64 no, blockno;
dma_addr_t phys_addr;
@@ -2913,25 +2914,25 @@ static int gdth_fill_cache_cmd(int hanum,Scsi_Cmnd *scp,ushort hdrive)
if (mode64) {
cmdp->u.cache64.DestAddr= (ulong64)-1;
cmdp->u.cache64.sg_canz = sgcnt;
- for (i=0; i<sgcnt; ++i,++sl) {
- cmdp->u.cache64.sg_lst[i].sg_ptr = sg_dma_address(sl);
+ for_each_sg(sl, sg, sgcnt, i) {
+ cmdp->u.cache64.sg_lst[i].sg_ptr = sg_dma_address(sg);
#ifdef GDTH_DMA_STATISTICS
if (cmdp->u.cache64.sg_lst[i].sg_ptr > (ulong64)0xffffffff)
ha->dma64_cnt++;
else
ha->dma32_cnt++;
#endif
- cmdp->u.cache64.sg_lst[i].sg_len = sg_dma_len(sl);
+ cmdp->u.cache64.sg_lst[i].sg_len = sg_dma_len(sg);
}
} else {
cmdp->u.cache.DestAddr= 0xffffffff;
cmdp->u.cache.sg_canz = sgcnt;
- for (i=0; i<sgcnt; ++i,++sl) {
- cmdp->u.cache.sg_lst[i].sg_ptr = sg_dma_address(sl);
+ for_each_sg(sl, sg, sgcnt, i) {
+ cmdp->u.cache.sg_lst[i].sg_ptr = sg_dma_address(sg);
#ifdef GDTH_DMA_STATISTICS
ha->dma32_cnt++;
#endif
- cmdp->u.cache.sg_lst[i].sg_len = sg_dma_len(sl);
+ cmdp->u.cache.sg_lst[i].sg_len = sg_dma_len(sg);
}
}

@@ -3017,7 +3018,7 @@ static int gdth_fill_raw_cmd(int hanum,Scsi_Cmnd *scp,unchar b)
{
register gdth_ha_str *ha;
register gdth_cmd_str *cmdp;
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;
ushort i;
dma_addr_t phys_addr, sense_paddr;
int cmd_index, sgcnt, mode64;
@@ -3120,25 +3121,25 @@ static int gdth_fill_raw_cmd(int hanum,Scsi_Cmnd *scp,unchar b)
if (mode64) {
cmdp->u.raw64.sdata = (ulong64)-1;
cmdp->u.raw64.sg_ranz = sgcnt;
- for (i=0; i<sgcnt; ++i,++sl) {
- cmdp->u.raw64.sg_lst[i].sg_ptr = sg_dma_address(sl);
+ for_each_sg(sl, sg, sgcnt, i) {
+ cmdp->u.raw64.sg_lst[i].sg_ptr = sg_dma_address(sg);
#ifdef GDTH_DMA_STATISTICS
if (cmdp->u.raw64.sg_lst[i].sg_ptr > (ulong64)0xffffffff)
ha->dma64_cnt++;
else
ha->dma32_cnt++;
#endif
- cmdp->u.raw64.sg_lst[i].sg_len = sg_dma_len(sl);
+ cmdp->u.raw64.sg_lst[i].sg_len = sg_dma_len(sg);
}
} else {
cmdp->u.raw.sdata = 0xffffffff;
cmdp->u.raw.sg_ranz = sgcnt;
- for (i=0; i<sgcnt; ++i,++sl) {
- cmdp->u.raw.sg_lst[i].sg_ptr = sg_dma_address(sl);
+ for_each_sg(sl, sg, sgcnt, i) {
+ cmdp->u.raw.sg_lst[i].sg_ptr = sg_dma_address(sg);
#ifdef GDTH_DMA_STATISTICS
ha->dma32_cnt++;
#endif
- cmdp->u.raw.sg_lst[i].sg_len = sg_dma_len(sl);
+ cmdp->u.raw.sg_lst[i].sg_len = sg_dma_len(sg);
}
}

diff --git a/drivers/scsi/hptiop.c b/drivers/scsi/hptiop.c
index bec83cb..5b1c210 100644
--- a/drivers/scsi/hptiop.c
+++ b/drivers/scsi/hptiop.c
@@ -449,6 +449,7 @@ static int hptiop_buildsgl(struct scsi_cmnd *scp, struct hpt_iopsg *psg)
struct Scsi_Host *host = scp->device->host;
struct hptiop_hba *hba = (struct hptiop_hba *)host->hostdata;
struct scatterlist *sglist = (struct scatterlist *)scp->request_buffer;
+ struct scatterlist *sg;

/*
* though we'll not get non-use_sg fields anymore,
@@ -463,10 +464,9 @@ static int hptiop_buildsgl(struct scsi_cmnd *scp, struct hpt_iopsg *psg)
HPT_SCP(scp)->mapped = 1;
BUG_ON(HPT_SCP(scp)->sgcnt > hba->max_sg_descriptors);

- for (idx = 0; idx < HPT_SCP(scp)->sgcnt; idx++) {
- psg[idx].pci_address =
- cpu_to_le64(sg_dma_address(&sglist[idx]));
- psg[idx].size = cpu_to_le32(sg_dma_len(&sglist[idx]));
+ for_each_sg(sglist, sg, HPT_SCP(scp)->sgcnt, idx) {
+ psg[idx].pci_address = cpu_to_le64(sg_dma_address(sg));
+ psg[idx].size = cpu_to_le32(sg_dma_len(sg));
psg[idx].eot = (idx == HPT_SCP(scp)->sgcnt - 1) ?
cpu_to_le32(1) : 0;
}
diff --git a/drivers/scsi/ibmmca.c b/drivers/scsi/ibmmca.c
index 0e57fb6..f6c2581 100644
--- a/drivers/scsi/ibmmca.c
+++ b/drivers/scsi/ibmmca.c
@@ -1808,7 +1808,7 @@ static int ibmmca_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
int host_index;
int max_pun;
int i;
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;

shpnt = cmd->device->host;
/* search for the right hostadapter */
@@ -1938,13 +1938,12 @@ static int ibmmca_queuecommand(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *))
scsi_cmd = cmd->cmnd[0];

if (cmd->use_sg) {
- i = cmd->use_sg;
sl = (struct scatterlist *) (cmd->request_buffer);
- if (i > 16)
+ if (cmd->use_sg > 16)
panic("IBM MCA SCSI: scatter-gather list too long.\n");
- while (--i >= 0) {
- ld(host_index)[ldn].sge[i].address = (void *) (isa_page_to_bus(sl[i].page) + sl[i].offset);
- ld(host_index)[ldn].sge[i].byte_length = sl[i].length;
+ for_each_sg(sl, sg, cmd->use_sg, i) {
+ ld(host_index)[ldn].sge[i].address = (void *) (isa_page_to_bus(sg->page) + sg->offset);
+ ld(host_index)[ldn].sge[i].byte_length = sg->length;
}
scb->enable |= IM_POINTER_TO_LIST;
scb->sys_buf_adr = isa_virt_to_bus(&(ld(host_index)[ldn].sge[0]));
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index b10eefe..943a01e 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -359,10 +359,10 @@ static int map_sg_list(int num_entries,
{
int i;
u64 total_length = 0;
+ struct scatterlist *sg_entry;

- for (i = 0; i < num_entries; ++i) {
+ for_each_sg(sg, sg_entry, num_entries, i) {
struct srp_direct_buf *descr = md + i;
- struct scatterlist *sg_entry = &sg[i];
descr->va = sg_dma_address(sg_entry);
descr->len = sg_dma_len(sg_entry);
descr->key = 0;
diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 8263f75..9101928 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -70,6 +70,7 @@ typedef struct idescsi_pc_s {
u8 *buffer; /* Data buffer */
u8 *current_position; /* Pointer into the above buffer */
struct scatterlist *sg; /* Scatter gather table */
+ struct scatterlist *last_sg; /* Last sg element */
int b_count; /* Bytes transferred from current entry */
struct scsi_cmnd *scsi_cmd; /* SCSI command */
void (*done)(struct scsi_cmnd *); /* Scsi completion routine */
@@ -175,11 +176,6 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
char *buf;

while (bcount) {
- if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
- printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
- idescsi_discard_data (drive, bcount);
- return;
- }
count = min(pc->sg->length - pc->b_count, bcount);
if (PageHighMem(pc->sg->page)) {
unsigned long flags;
@@ -198,10 +194,17 @@ static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigne
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
- pc->sg++;
+ if (pc->sg == pc->last_sg)
+ break;
+ pc->sg = sg_next(pc->sg);
pc->b_count = 0;
}
}
+
+ if (bcount) {
+ printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
+ idescsi_discard_data (drive, bcount);
+ }
}

static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
@@ -210,11 +213,6 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
char *buf;

while (bcount) {
- if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
- printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
- idescsi_output_zeros (drive, bcount);
- return;
- }
count = min(pc->sg->length - pc->b_count, bcount);
if (PageHighMem(pc->sg->page)) {
unsigned long flags;
@@ -233,10 +231,17 @@ static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsign
}
bcount -= count; pc->b_count += count;
if (pc->b_count == pc->sg->length) {
- pc->sg++;
+ if (pc->sg == pc->last_sg)
+ break;
+ pc->sg = sg_next(pc->sg);
pc->b_count = 0;
}
}
+
+ if (bcount) {
+ printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
+ idescsi_output_zeros (drive, bcount);
+ }
}

/*
@@ -910,9 +915,11 @@ static int idescsi_queue (struct scsi_cmnd *cmd,
if (cmd->use_sg) {
pc->buffer = NULL;
pc->sg = cmd->request_buffer;
+ pc->last_sg = sg_last(pc->sg, cmd->use_sg);
} else {
pc->buffer = cmd->request_buffer;
pc->sg = NULL;
+ pc->last_sg = NULL;
}
pc->b_count = 0;
pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
diff --git a/drivers/scsi/initio.c b/drivers/scsi/initio.c
index 7e7635c..300d33d 100644
--- a/drivers/scsi/initio.c
+++ b/drivers/scsi/initio.c
@@ -2882,7 +2882,7 @@ static int i91u_detect(struct scsi_host_template * tpnt)

static void i91uBuildSCB(HCS * pHCB, SCB * pSCB, struct scsi_cmnd * SCpnt)
{ /* Create corresponding SCB */
- struct scatterlist *pSrbSG;
+ struct scatterlist *pSrbSG, *sg;
SG *pSG; /* Pointer to SG list */
int i;
long TotalLen;
@@ -2926,10 +2926,12 @@ static void i91uBuildSCB(HCS * pHCB, SCB * pSCB, struct scsi_cmnd * SCpnt)
SCpnt->use_sg, SCpnt->sc_data_direction);

pSCB->SCB_Flags |= SCF_SG; /* Turn on SG list flag */
- for (i = 0, TotalLen = 0, pSG = &pSCB->SCB_SGList[0]; /* 1.01g */
- i < pSCB->SCB_SGLen; i++, pSG++, pSrbSG++) {
- pSG->SG_Ptr = cpu_to_le32((u32)sg_dma_address(pSrbSG));
- TotalLen += pSG->SG_Len = cpu_to_le32((u32)sg_dma_len(pSrbSG));
+ pSG = &pSCB->SCB_SGList[0];
+ TotalLen = 0;
+ for_each_sg(pSrbSG, sg, pSCB->SCB_SGLen, i) {
+ pSG->SG_Ptr = cpu_to_le32((u32)sg_dma_address(sg));
+ TotalLen += pSG->SG_Len = cpu_to_le32((u32)sg_dma_len(sg));
+ pSG++;
}

pSCB->SCB_BufLen = (SCpnt->request_bufflen > TotalLen) ?
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 4baa79e..01b0476 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -4286,7 +4286,7 @@ static int ipr_build_ioadl(struct ipr_ioa_cfg *ioa_cfg,
struct ipr_cmnd *ipr_cmd)
{
int i;
- struct scatterlist *sglist;
+ struct scatterlist *sglist, *sg;
u32 length;
u32 ioadl_flags = 0;
struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;
@@ -4327,11 +4327,10 @@ static int ipr_build_ioadl(struct ipr_ioa_cfg *ioa_cfg,
ioarcb->read_ioadl_addr = ioarcb->write_ioadl_addr;
}

- for (i = 0; i < ipr_cmd->dma_use_sg; i++) {
+ for_each_sg(sglist, sg, ipr_cmd->dma_use_sg, i) {
ioadl[i].flags_and_data_len =
- cpu_to_be32(ioadl_flags | sg_dma_len(&sglist[i]));
- ioadl[i].address =
- cpu_to_be32(sg_dma_address(&sglist[i]));
+ cpu_to_be32(ioadl_flags | sg_dma_len(sg));
+ ioadl[i].address = cpu_to_be32(sg_dma_address(sg));
}

if (likely(ipr_cmd->dma_use_sg)) {
diff --git a/drivers/scsi/ips.c b/drivers/scsi/ips.c
index 8b704f7..ba1957a 100644
--- a/drivers/scsi/ips.c
+++ b/drivers/scsi/ips.c
@@ -1687,10 +1687,11 @@ ips_make_passthru(ips_ha_t *ha, struct scsi_cmnd *SC, ips_scb_t *scb, int intr)
if (!SC->use_sg) {
length = SC->request_bufflen;
} else {
- struct scatterlist *sg = SC->request_buffer;
+ struct scatterlist *sgl = SC->request_buffer;
+ struct scatterlist *sg;
int i;
- for (i = 0; i < SC->use_sg; i++)
- length += sg[i].length;
+ for_each_sg(sgl, sg, SC->use_sg, i)
+ length += sg->length;
}
if (length < sizeof (ips_passthru_t)) {
/* wrong size */
@@ -2868,17 +2869,17 @@ ips_next(ips_ha_t * ha, int intr)

/* Now handle the data buffer */
if (SC->use_sg) {
- struct scatterlist *sg;
+ struct scatterlist *sg, *sgl;
int i;

- sg = SC->request_buffer;
- scb->sg_count = pci_map_sg(ha->pcidev, sg, SC->use_sg,
+ sgl = SC->request_buffer;
+ scb->sg_count = pci_map_sg(ha->pcidev, sgl, SC->use_sg,
SC->sc_data_direction);
scb->flags |= IPS_SCB_MAP_SG;
- for (i = 0; i < scb->sg_count; i++) {
+ for_each_sg(sgl, sg, scb->sg_count, i) {
if (ips_fill_scb_sg_single
- (ha, sg_dma_address(&sg[i]), scb, i,
- sg_dma_len(&sg[i])) < 0)
+ (ha, sg_dma_address(sg), scb, i,
+ sg_dma_len(sg)) < 0)
break;
}
scb->dcdb.transfer_length = scb->data_len;
@@ -3382,32 +3383,31 @@ ips_done(ips_ha_t * ha, ips_scb_t * scb)

if (scb->sg_count) {
/* S/G request */
- struct scatterlist *sg;
+ struct scatterlist *sg, *sgl;
int ips_sg_index = 0;
- int sg_dma_index;
+ int sg_dma_index, left, i;

- sg = scb->scsi_cmd->request_buffer;
+ sgl = scb->scsi_cmd->request_buffer;

/* Spin forward to last dma chunk */
sg_dma_index = scb->breakup;
+ sg = sg_last(sgl, sg_dma_index);

/* Take care of possible partial on last chunk */
ips_fill_scb_sg_single(ha,
- sg_dma_address(&sg
- [sg_dma_index]),
+ sg_dma_address(sg),
scb, ips_sg_index++,
- sg_dma_len(&sg
- [sg_dma_index]));
+ sg_dma_len(sg));

- for (; sg_dma_index < scb->sg_count;
- sg_dma_index++) {
+ sgl = sg;
+ left = scb->sg_count - sg_dma_index;
+ for_each_sg(sgl, sg, left, i) {
if (ips_fill_scb_sg_single
(ha,
- sg_dma_address(&sg[sg_dma_index]),
+ sg_dma_address(sg),
scb, ips_sg_index++,
- sg_dma_len(&sg[sg_dma_index])) < 0)
+ sg_dma_len(sg)) < 0)
break;
-
}

} else {
@@ -3659,17 +3659,21 @@ ips_scmd_buf_write(struct scsi_cmnd *scmd, void *data, unsigned int count)
char *cdata = (char *) data;
unsigned char *buffer;
unsigned long flags;
- struct scatterlist *sg = scmd->request_buffer;
- for (i = 0, xfer_cnt = 0;
- (i < scmd->use_sg) && (xfer_cnt < count); i++) {
- min_cnt = min(count - xfer_cnt, sg[i].length);
+ struct scatterlist *sgl = scmd->request_buffer;
+ struct scatterlist *sg;
+
+ xfer_cnt = 0;
+ for_each_sg(sgl, sg, scmd->use_sg, i) {
+ if (xfer_cnt >= count)
+ break;
+ min_cnt = min(count - xfer_cnt, sg->length);

/* kmap_atomic() ensures addressability of the data buffer.*/
/* local_irq_save() protects the KM_IRQ0 address slot. */
local_irq_save(flags);
- buffer = kmap_atomic(sg[i].page, KM_IRQ0) + sg[i].offset;
+ buffer = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
memcpy(buffer, &cdata[xfer_cnt], min_cnt);
- kunmap_atomic(buffer - sg[i].offset, KM_IRQ0);
+ kunmap_atomic(buffer - sg->offset, KM_IRQ0);
local_irq_restore(flags);

xfer_cnt += min_cnt;
@@ -3697,17 +3701,21 @@ ips_scmd_buf_read(struct scsi_cmnd *scmd, void *data, unsigned int count)
char *cdata = (char *) data;
unsigned char *buffer;
unsigned long flags;
- struct scatterlist *sg = scmd->request_buffer;
- for (i = 0, xfer_cnt = 0;
- (i < scmd->use_sg) && (xfer_cnt < count); i++) {
- min_cnt = min(count - xfer_cnt, sg[i].length);
+ struct scatterlist *sgl = scmd->request_buffer;
+ struct scatterlist *sg;
+
+ xfer_cnt = 0;
+ for_each_sg(sgl, sg, scmd->use_sg, i) {
+ if (xfer_cnt >= count)
+ break;
+ min_cnt = min(count - xfer_cnt, sg->length);

/* kmap_atomic() ensures addressability of the data buffer.*/
/* local_irq_save() protects the KM_IRQ0 address slot. */
local_irq_save(flags);
- buffer = kmap_atomic(sg[i].page, KM_IRQ0) + sg[i].offset;
+ buffer = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
memcpy(&cdata[xfer_cnt], buffer, min_cnt);
- kunmap_atomic(buffer - sg[i].offset, KM_IRQ0);
+ kunmap_atomic(buffer - sg->offset, KM_IRQ0);
local_irq_restore(flags);

xfer_cnt += min_cnt;
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index c9a3abf..8f709fa 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -310,10 +310,11 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,

if (sc->use_sg) {
int i, sg_count = 0;
- struct scatterlist *sg = sc->request_buffer;
+ struct scatterlist *sgl = sc->request_buffer;
+ struct scatterlist *sg;

r2t->sg = NULL;
- for (i = 0; i < sc->use_sg; i++, sg += 1) {
+ for_each_sg(sgl, sg, sc->use_sg, i) {
/* FIXME: prefetch ? */
if (sg_count + sg->length > r2t->data_offset) {
int page_offset;
@@ -329,7 +330,7 @@ iscsi_solicit_data_init(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
r2t->sendbuf.sg.length -= page_offset;

/* xmit logic will continue with next one */
- r2t->sg = sg + 1;
+ r2t->sg = sg_next(sg);
break;
}
sg_count += sg->length;
@@ -702,7 +703,7 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
struct iscsi_cmd_task *ctask = tcp_conn->in.ctask;
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
struct scsi_cmnd *sc = ctask->sc;
- struct scatterlist *sg;
+ struct scatterlist *sg, *sgl;
int i, offset, rc = 0;

BUG_ON((void*)ctask != sc->SCp.ptr);
@@ -725,21 +726,21 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
}

offset = tcp_ctask->data_offset;
- sg = sc->request_buffer;
+ sgl = sc->request_buffer;

if (tcp_ctask->data_offset)
- for (i = 0; i < tcp_ctask->sg_count; i++)
- offset -= sg[i].length;
+ for_each_sg(sgl, sg, tcp_ctask->sg_count, i)
+ offset -= sg->length;
/* we've passed through partial sg*/
if (offset < 0)
offset = 0;

- for (i = tcp_ctask->sg_count; i < sc->use_sg; i++) {
+ for_each_sg(sgl, sg, tcp_ctask->sg_count, i) {
char *dest;

- dest = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
- rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg[i].offset,
- sg[i].length, offset);
+ dest = kmap_atomic(sg->page, KM_SOFTIRQ0);
+ rc = iscsi_ctask_copy(tcp_conn, ctask, dest + sg->offset,
+ sg->length, offset);
kunmap_atomic(dest, KM_SOFTIRQ0);
if (rc == -EAGAIN)
/* continue with the next SKB/PDU */
@@ -749,13 +750,13 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
if (!offset)
crypto_hash_update(
&tcp_conn->rx_hash,
- &sg[i], sg[i].length);
+ sg, sg->length);
else
partial_sg_digest_update(
&tcp_conn->rx_hash,
- &sg[i],
- sg[i].offset + offset,
- sg[i].length - offset);
+ sg,
+ sg->offset + offset,
+ sg->length - offset);
}
offset = 0;
tcp_ctask->sg_count++;
@@ -767,9 +768,9 @@ static int iscsi_scsi_data_in(struct iscsi_conn *conn)
* data-in is complete, but buffer not...
*/
partial_sg_digest_update(&tcp_conn->rx_hash,
- &sg[i],
- sg[i].offset,
- sg[i].length-rc);
+ sg,
+ sg->offset,
+ sg->length-rc);
rc = 0;
break;
}
@@ -1294,8 +1295,8 @@ iscsi_tcp_cmd_init(struct iscsi_cmd_task *ctask)
struct scatterlist *sg = sc->request_buffer;

iscsi_buf_init_sg(&tcp_ctask->sendbuf, sg);
- tcp_ctask->sg = sg + 1;
- tcp_ctask->bad_sg = sg + sc->use_sg;
+ tcp_ctask->sg = sg_next(sg);
+ tcp_ctask->bad_sg = sg_last(sg, sc->use_sg);
} else {
iscsi_buf_init_iov(&tcp_ctask->sendbuf,
sc->request_buffer,
@@ -1522,7 +1523,7 @@ iscsi_send_data(struct iscsi_cmd_task *ctask, struct iscsi_buf *sendbuf,
buf_sent);
if (!iscsi_buf_left(sendbuf) && *sg != tcp_ctask->bad_sg) {
iscsi_buf_init_sg(sendbuf, *sg);
- *sg = *sg + 1;
+ *sg = sg_next(*sg);
}

if (rc)
diff --git a/drivers/scsi/jazz_esp.c b/drivers/scsi/jazz_esp.c
index 19dd4b9..d742c73 100644
--- a/drivers/scsi/jazz_esp.c
+++ b/drivers/scsi/jazz_esp.c
@@ -15,6 +15,7 @@
#include <linux/blkdev.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
+#include <linux/dma-mapping.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
@@ -240,12 +241,13 @@ static void dma_mmu_get_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)
static void dma_mmu_get_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
{
int sz = sp->SCp.buffers_residual;
- struct scatterlist *sg = (struct scatterlist *) sp->SCp.buffer;
-
- while (sz >= 0) {
- sg[sz].dma_address = vdma_alloc(CPHYSADDR(page_address(sg[sz].page) + sg[sz].offset), sg[sz].length);
- sz--;
- }
+ struct scatterlist *sgl = (struct scatterlist *) sp->SCp.buffer;
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sgl, sg, sz, i)
+ sg->dma_address = vdma_alloc(CPHYSADDR(page_address(sg->page) + sg->offset), sg->length);
+
sp->SCp.ptr=(char *)(sp->SCp.buffer->dma_address);
}

@@ -256,13 +258,12 @@ static void dma_mmu_release_scsi_one (struct NCR_ESP *esp, struct scsi_cmnd *sp)

static void dma_mmu_release_scsi_sgl (struct NCR_ESP *esp, struct scsi_cmnd *sp)
{
- int sz = sp->use_sg - 1;
- struct scatterlist *sg = (struct scatterlist *)sp->request_buffer;
-
- while(sz >= 0) {
- vdma_free(sg[sz].dma_address);
- sz--;
- }
+ struct scatterlist *sgl = (struct scatterlist *)sp->request_buffer;
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sgl, sg, sp->use_sg, i)
+ vdma_free(sg->dma_address);
}

static void dma_advance_sg (struct scsi_cmnd *sp)
diff --git a/drivers/scsi/lpfc/lpfc_scsi.c b/drivers/scsi/lpfc/lpfc_scsi.c
index 9a12d05..d1f6654 100644
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -169,7 +169,7 @@ static int
lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
{
struct scsi_cmnd *scsi_cmnd = lpfc_cmd->pCmd;
- struct scatterlist *sgel = NULL;
+ struct scatterlist *sgel = NULL, *sg;
struct fcp_cmnd *fcp_cmnd = lpfc_cmd->fcp_cmnd;
struct ulp_bde64 *bpl = lpfc_cmd->fcp_bpl;
IOCB_t *iocb_cmd = &lpfc_cmd->cur_iocbq.iocb;
@@ -214,18 +214,17 @@ lpfc_scsi_prep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * lpfc_cmd)
* single scsi command. Just run through the seg_cnt and format
* the bde's.
*/
- for (i = 0; i < lpfc_cmd->seg_cnt; i++) {
- physaddr = sg_dma_address(sgel);
+ for_each_sg(sgel, sg, lpfc_cmd->seg_cnt, i) {
+ physaddr = sg_dma_address(sg);
bpl->addrLow = le32_to_cpu(putPaddrLow(physaddr));
bpl->addrHigh = le32_to_cpu(putPaddrHigh(physaddr));
- bpl->tus.f.bdeSize = sg_dma_len(sgel);
+ bpl->tus.f.bdeSize = sg_dma_len(sg);
if (datadir == DMA_TO_DEVICE)
bpl->tus.f.bdeFlags = 0;
else
bpl->tus.f.bdeFlags = BUFF_USE_RCV;
bpl->tus.w = le32_to_cpu(bpl->tus.w);
bpl++;
- sgel++;
num_bde++;
}
} else if (scsi_cmnd->request_buffer && scsi_cmnd->request_bufflen) {
diff --git a/drivers/scsi/mac53c94.c b/drivers/scsi/mac53c94.c
index 5806ede..cb569c6 100644
--- a/drivers/scsi/mac53c94.c
+++ b/drivers/scsi/mac53c94.c
@@ -366,7 +366,7 @@ static void cmd_done(struct fsc_state *state, int result)
static void set_dma_cmds(struct fsc_state *state, struct scsi_cmnd *cmd)
{
int i, dma_cmd, total;
- struct scatterlist *scl;
+ struct scatterlist *scl, *sg;
struct dbdma_cmd *dcmds;
dma_addr_t dma_addr;
u32 dma_len;
@@ -381,9 +381,9 @@ static void set_dma_cmds(struct fsc_state *state, struct scsi_cmnd *cmd)
scl = (struct scatterlist *) cmd->request_buffer;
nseg = pci_map_sg(state->pdev, scl, cmd->use_sg,
cmd->sc_data_direction);
- for (i = 0; i < nseg; ++i) {
- dma_addr = sg_dma_address(scl);
- dma_len = sg_dma_len(scl);
+ for_each_sg(scl, sg, nseg, i) {
+ dma_addr = sg_dma_address(sg);
+ dma_len = sg_dma_len(sg);
if (dma_len > 0xffff)
panic("mac53c94: scatterlist element >= 64k");
total += dma_len;
@@ -391,7 +391,6 @@ static void set_dma_cmds(struct fsc_state *state, struct scsi_cmnd *cmd)
st_le16(&dcmds->command, dma_cmd);
st_le32(&dcmds->phy_addr, dma_addr);
dcmds->xfer_status = 0;
- ++scl;
++dcmds;
}
} else {
diff --git a/drivers/scsi/megaraid.c b/drivers/scsi/megaraid.c
index 3cce75d..0ea9ef4 100644
--- a/drivers/scsi/megaraid.c
+++ b/drivers/scsi/megaraid.c
@@ -1767,7 +1767,7 @@ __mega_busywait_mbox (adapter_t *adapter)
static int
mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)
{
- struct scatterlist *sgl;
+ struct scatterlist *sgl, *sg;
struct page *page;
unsigned long offset;
unsigned int length;
@@ -1832,15 +1832,14 @@ mega_build_sglist(adapter_t *adapter, scb_t *scb, u32 *buf, u32 *len)

*len = 0;

- for( idx = 0; idx < sgcnt; idx++, sgl++ ) {
-
+ for_each_sg(sgl, sg, sgcnt, idx) {
if( adapter->has_64bit_addr ) {
- scb->sgl64[idx].address = sg_dma_address(sgl);
- *len += scb->sgl64[idx].length = sg_dma_len(sgl);
+ scb->sgl64[idx].address = sg_dma_address(sg);
+ *len += scb->sgl64[idx].length = sg_dma_len(sg);
}
else {
- scb->sgl[idx].address = sg_dma_address(sgl);
- *len += scb->sgl[idx].length = sg_dma_len(sgl);
+ scb->sgl[idx].address = sg_dma_address(sg);
+ *len += scb->sgl[idx].length = sg_dma_len(sg);
}
}

diff --git a/drivers/scsi/megaraid/megaraid_mbox.c b/drivers/scsi/megaraid/megaraid_mbox.c
index 04d0b69..6b1ee7f 100644
--- a/drivers/scsi/megaraid/megaraid_mbox.c
+++ b/drivers/scsi/megaraid/megaraid_mbox.c
@@ -1377,6 +1377,7 @@ static int
megaraid_mbox_mksgl(adapter_t *adapter, scb_t *scb)
{
struct scatterlist *sgl;
+ struct scatterlist *sg;
mbox_ccb_t *ccb;
struct page *page;
unsigned long offset;
@@ -1429,9 +1430,9 @@ megaraid_mbox_mksgl(adapter_t *adapter, scb_t *scb)

scb->dma_type = MRAID_DMA_WSG;

- for (i = 0; i < sgcnt; i++, sgl++) {
- ccb->sgl64[i].address = sg_dma_address(sgl);
- ccb->sgl64[i].length = sg_dma_len(sgl);
+ for_each_sg(sgl, sg, sgcnt, i) {
+ ccb->sgl64[i].address = sg_dma_address(sg);
+ ccb->sgl64[i].length = sg_dma_len(sg);
}

// Return count of SG nodes
diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 7a81267..5260bc6 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -431,7 +431,7 @@ megasas_make_sgl32(struct megasas_instance *instance, struct scsi_cmnd *scp,
{
int i;
int sge_count;
- struct scatterlist *os_sgl;
+ struct scatterlist *os_sgl, *sg;

/*
* Return 0 if there is no data transfer
@@ -456,9 +456,9 @@ megasas_make_sgl32(struct megasas_instance *instance, struct scsi_cmnd *scp,
sge_count = pci_map_sg(instance->pdev, os_sgl, scp->use_sg,
scp->sc_data_direction);

- for (i = 0; i < sge_count; i++, os_sgl++) {
- mfi_sgl->sge32[i].length = sg_dma_len(os_sgl);
- mfi_sgl->sge32[i].phys_addr = sg_dma_address(os_sgl);
+ for_each_sg(os_sgl, sg, sge_count, i) {
+ mfi_sgl->sge32[i].length = sg_dma_len(sg);
+ mfi_sgl->sge32[i].phys_addr = sg_dma_address(sg);
}

return sge_count;
@@ -479,7 +479,7 @@ megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
{
int i;
int sge_count;
- struct scatterlist *os_sgl;
+ struct scatterlist *os_sgl, *sg;

/*
* Return 0 if there is no data transfer
@@ -505,9 +505,9 @@ megasas_make_sgl64(struct megasas_instance *instance, struct scsi_cmnd *scp,
sge_count = pci_map_sg(instance->pdev, os_sgl, scp->use_sg,
scp->sc_data_direction);

- for (i = 0; i < sge_count; i++, os_sgl++) {
- mfi_sgl->sge64[i].length = sg_dma_len(os_sgl);
- mfi_sgl->sge64[i].phys_addr = sg_dma_address(os_sgl);
+ for_each_sg(os_sgl, sg, sge_count, i) {
+ mfi_sgl->sge64[i].length = sg_dma_len(sg);
+ mfi_sgl->sge64[i].phys_addr = sg_dma_address(sg);
}

return sge_count;
diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c
index e64d1a1..66519aa 100644
--- a/drivers/scsi/mesh.c
+++ b/drivers/scsi/mesh.c
@@ -1257,7 +1257,7 @@ static void handle_msgin(struct mesh_state *ms)
static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
{
int i, dma_cmd, total, off, dtot;
- struct scatterlist *scl;
+ struct scatterlist *scl, *sg;
struct dbdma_cmd *dcmds;

dma_cmd = ms->tgts[ms->conn_tgt].data_goes_out?
@@ -1267,17 +1267,17 @@ static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd)
if (cmd) {
cmd->SCp.this_residual = cmd->request_bufflen;
if (cmd->use_sg > 0) {
- int nseg;
+ int nseg, i;
total = 0;
scl = (struct scatterlist *) cmd->request_buffer;
off = ms->data_ptr;
nseg = pci_map_sg(ms->pdev, scl, cmd->use_sg,
cmd->sc_data_direction);
- for (i = 0; i <nseg; ++i, ++scl) {
- u32 dma_addr = sg_dma_address(scl);
- u32 dma_len = sg_dma_len(scl);
+ for_each_sg(scl, sg, nseg, i) {
+ u32 dma_addr = sg_dma_address(sg);
+ u32 dma_len = sg_dma_len(sg);

- total += scl->length;
+ total += sg->length;
if (off >= dma_len) {
off -= dma_len;
continue;
diff --git a/drivers/scsi/ncr53c8xx.c b/drivers/scsi/ncr53c8xx.c
index bbf521c..e6210c6 100644
--- a/drivers/scsi/ncr53c8xx.c
+++ b/drivers/scsi/ncr53c8xx.c
@@ -7700,6 +7700,7 @@ static int ncr_scatter(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd)
segment = ncr_scatter_no_sglist(np, cp, cmd);
else if ((use_sg = map_scsi_sg_data(np, cmd)) > 0) {
struct scatterlist *scatter = (struct scatterlist *)cmd->request_buffer;
+ struct scatterlist *sg;
struct scr_tblmove *data;

if (use_sg > MAX_SCATTER) {
@@ -7709,9 +7710,9 @@ static int ncr_scatter(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd)

data = &cp->phys.data[MAX_SCATTER - use_sg];

- for (segment = 0; segment < use_sg; segment++) {
- dma_addr_t baddr = sg_dma_address(&scatter[segment]);
- unsigned int len = sg_dma_len(&scatter[segment]);
+ for_each_sg(scatter, sg, use_sg, segment) {
+ dma_addr_t baddr = sg_dma_address(sg);
+ unsigned int len = sg_dma_len(sg);

ncr_build_sge(np, &data[segment], baddr, len);
cp->data_len += len;
diff --git a/drivers/scsi/nsp32.c b/drivers/scsi/nsp32.c
index f6f561d..32426a9 100644
--- a/drivers/scsi/nsp32.c
+++ b/drivers/scsi/nsp32.c
@@ -888,7 +888,7 @@ static int nsp32_reselection(struct scsi_cmnd *SCpnt, unsigned char newlun)
static int nsp32_setup_sg_table(struct scsi_cmnd *SCpnt)
{
nsp32_hw_data *data = (nsp32_hw_data *)SCpnt->device->host->hostdata;
- struct scatterlist *sgl;
+ struct scatterlist *sgl, *sg;
nsp32_sgtable *sgt = data->cur_lunt->sglun->sgt;
int num, i;
u32_le l;
@@ -906,13 +906,12 @@ static int nsp32_setup_sg_table(struct scsi_cmnd *SCpnt)
sgl = (struct scatterlist *)SCpnt->request_buffer;
num = pci_map_sg(data->Pci, sgl, SCpnt->use_sg,
SCpnt->sc_data_direction);
- for (i = 0; i < num; i++) {
+ for_each_sg(sgl, sg, num, i) {
/*
* Build nsp32_sglist, substitute sg dma addresses.
*/
- sgt[i].addr = cpu_to_le32(sg_dma_address(sgl));
- sgt[i].len = cpu_to_le32(sg_dma_len(sgl));
- sgl++;
+ sgt[i].addr = cpu_to_le32(sg_dma_address(sg));
+ sgt[i].len = cpu_to_le32(sg_dma_len(sg));

if (le32_to_cpu(sgt[i].len) > 0x10000) {
nsp32_msg(KERN_ERR,
diff --git a/drivers/scsi/pcmcia/sym53c500_cs.c b/drivers/scsi/pcmcia/sym53c500_cs.c
index ffe75c4..b1e9270 100644
--- a/drivers/scsi/pcmcia/sym53c500_cs.c
+++ b/drivers/scsi/pcmcia/sym53c500_cs.c
@@ -442,12 +442,13 @@ SYM53C500_intr(int irq, void *dev_id)
if (!curSC->use_sg) /* Don't use scatter-gather */
SYM53C500_pio_write(fast_pio, port_base, curSC->request_buffer, curSC->request_bufflen);
else { /* use scatter-gather */
+ struct scatterlist *sg;
+ int i;
+
sgcount = curSC->use_sg;
sglist = curSC->request_buffer;
- while (sgcount--) {
- SYM53C500_pio_write(fast_pio, port_base, page_address(sglist->page) + sglist->offset, sglist->length);
- sglist++;
- }
+ for_each_sg(sglist, sg, sgcount, i)
+ SYM53C500_pio_write(fast_pio, port_base, page_address(sg->page) + sg->offset, sg->length);
}
REG0(port_base);
}
@@ -463,12 +464,13 @@ SYM53C500_intr(int irq, void *dev_id)
if (!curSC->use_sg) /* Don't use scatter-gather */
SYM53C500_pio_read(fast_pio, port_base, curSC->request_buffer, curSC->request_bufflen);
else { /* Use scatter-gather */
+ struct scatterlist *sg;
+ int i;
+
sgcount = curSC->use_sg;
sglist = curSC->request_buffer;
- while (sgcount--) {
- SYM53C500_pio_read(fast_pio, port_base, page_address(sglist->page) + sglist->offset, sglist->length);
- sglist++;
- }
+ for_each_sg(sglist, sg, sgcount, i)
+ SYM53C500_pio_read(fast_pio, port_base, page_address(sg->page) + sg->offset, sg->length);
}
REG0(port_base);
}
diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 54d8bdf..bd805ec 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -2775,7 +2775,7 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
struct device_reg __iomem *reg = ha->iobase;
struct scsi_cmnd *cmd = sp->cmd;
cmd_a64_entry_t *pkt;
- struct scatterlist *sg = NULL;
+ struct scatterlist *sg = NULL, *s;
__le32 *dword_ptr;
dma_addr_t dma_handle;
int status = 0;
@@ -2889,13 +2889,16 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
* Load data segments.
*/
if (seg_cnt) { /* If data transfer. */
+ int remseg = seg_cnt;
/* Setup packet address segment pointer. */
dword_ptr = (u32 *)&pkt->dseg_0_address;

if (cmd->use_sg) { /* If scatter gather */
/* Load command entry data segments. */
- for (cnt = 0; cnt < 2 && seg_cnt; cnt++, seg_cnt--) {
- dma_handle = sg_dma_address(sg);
+ for_each_sg(sg, s, seg_cnt, cnt) {
+ if (cnt == 2)
+ break;
+ dma_handle = sg_dma_address(s);
#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
if (ha->flags.use_pci_vchannel)
sn_pci_set_vchan(ha->pdev,
@@ -2906,12 +2909,12 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
cpu_to_le32(pci_dma_lo32(dma_handle));
*dword_ptr++ =
cpu_to_le32(pci_dma_hi32(dma_handle));
- *dword_ptr++ = cpu_to_le32(sg_dma_len(sg));
- sg++;
+ *dword_ptr++ = cpu_to_le32(sg_dma_len(s));
dprintk(3, "S/G Segment phys_addr=%x %x, len=0x%x\n",
cpu_to_le32(pci_dma_hi32(dma_handle)),
cpu_to_le32(pci_dma_lo32(dma_handle)),
- cpu_to_le32(sg_dma_len(sg)));
+ cpu_to_le32(sg_dma_len(sg_next(s))));
+ remseg--;
}
dprintk(5, "qla1280_64bit_start_scsi: Scatter/gather "
"command packet data - b %i, t %i, l %i \n",
@@ -2926,7 +2929,9 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
dprintk(3, "S/G Building Continuation...seg_cnt=0x%x "
"remains\n", seg_cnt);

- while (seg_cnt > 0) {
+ while (remseg > 0) {
+ /* Update sg start */
+ sg = s;
/* Adjust ring index. */
ha->req_ring_index++;
if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
@@ -2952,9 +2957,10 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
(u32 *)&((struct cont_a64_entry *) pkt)->dseg_0_address;

/* Load continuation entry data segments. */
- for (cnt = 0; cnt < 5 && seg_cnt;
- cnt++, seg_cnt--) {
- dma_handle = sg_dma_address(sg);
+ for_each_sg(sg, s, remseg, cnt) {
+ if (cnt == 5)
+ break;
+ dma_handle = sg_dma_address(s);
#if defined(CONFIG_IA64_GENERIC) || defined(CONFIG_IA64_SGI_SN2)
if (ha->flags.use_pci_vchannel)
sn_pci_set_vchan(ha->pdev,
@@ -2966,12 +2972,12 @@ qla1280_64bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
*dword_ptr++ =
cpu_to_le32(pci_dma_hi32(dma_handle));
*dword_ptr++ =
- cpu_to_le32(sg_dma_len(sg));
+ cpu_to_le32(sg_dma_len(s));
dprintk(3, "S/G Segment Cont. phys_addr=%x %x, len=0x%x\n",
cpu_to_le32(pci_dma_hi32(dma_handle)),
cpu_to_le32(pci_dma_lo32(dma_handle)),
- cpu_to_le32(sg_dma_len(sg)));
- sg++;
+ cpu_to_le32(sg_dma_len(s)));
+ remseg--;
}
dprintk(5, "qla1280_64bit_start_scsi: "
"continuation packet data - b %i, t "
@@ -3062,7 +3068,7 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
struct device_reg __iomem *reg = ha->iobase;
struct scsi_cmnd *cmd = sp->cmd;
struct cmd_entry *pkt;
- struct scatterlist *sg = NULL;
+ struct scatterlist *sg = NULL, *s;
__le32 *dword_ptr;
int status = 0;
int cnt;
@@ -3188,6 +3194,7 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
* Load data segments.
*/
if (seg_cnt) {
+ int remseg = seg_cnt;
/* Setup packet address segment pointer. */
dword_ptr = &pkt->dseg_0_address;

@@ -3196,22 +3203,25 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
qla1280_dump_buffer(1, (char *)sg, 4 * 16);

/* Load command entry data segments. */
- for (cnt = 0; cnt < 4 && seg_cnt; cnt++, seg_cnt--) {
+ for_each_sg(sg, s, seg_cnt, cnt) {
+ if (cnt == 4)
+ break;
*dword_ptr++ =
- cpu_to_le32(pci_dma_lo32(sg_dma_address(sg)));
- *dword_ptr++ =
- cpu_to_le32(sg_dma_len(sg));
+ cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
+ *dword_ptr++ = cpu_to_le32(sg_dma_len(s));
dprintk(3, "S/G Segment phys_addr=0x%lx, len=0x%x\n",
- (pci_dma_lo32(sg_dma_address(sg))),
- (sg_dma_len(sg)));
- sg++;
+ (pci_dma_lo32(sg_dma_address(s))),
+ (sg_dma_len(s)));
+ remseg--;
}
/*
* Build continuation packets.
*/
dprintk(3, "S/G Building Continuation"
"...seg_cnt=0x%x remains\n", seg_cnt);
- while (seg_cnt > 0) {
+ while (remseg > 0) {
+ /* Continue from end point */
+ sg = s;
/* Adjust ring index. */
ha->req_ring_index++;
if (ha->req_ring_index == REQUEST_ENTRY_CNT) {
@@ -3239,18 +3249,16 @@ qla1280_32bit_start_scsi(struct scsi_qla_host *ha, struct srb * sp)
&((struct cont_entry *) pkt)->dseg_0_address;

/* Load continuation entry data segments. */
- for (cnt = 0; cnt < 7 && seg_cnt;
- cnt++, seg_cnt--) {
+ for_each_sg(sg, s, remseg, cnt) {
*dword_ptr++ =
- cpu_to_le32(pci_dma_lo32(sg_dma_address(sg)));
+ cpu_to_le32(pci_dma_lo32(sg_dma_address(s)));
*dword_ptr++ =
- cpu_to_le32(sg_dma_len(sg));
+ cpu_to_le32(sg_dma_len(s));
dprintk(1,
"S/G Segment Cont. phys_addr=0x%x, "
"len=0x%x\n",
- cpu_to_le32(pci_dma_lo32(sg_dma_address(sg))),
- cpu_to_le32(sg_dma_len(sg)));
- sg++;
+ cpu_to_le32(pci_dma_lo32(sg_dma_address(s))),
+ cpu_to_le32(sg_dma_len(s)));
}
dprintk(5, "qla1280_32bit_start_scsi: "
"continuation packet data - "
diff --git a/drivers/scsi/qla2xxx/qla_iocb.c b/drivers/scsi/qla2xxx/qla_iocb.c
index c5b3c61..10251bf 100644
--- a/drivers/scsi/qla2xxx/qla_iocb.c
+++ b/drivers/scsi/qla2xxx/qla_iocb.c
@@ -671,12 +671,11 @@ qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,

/* Load data segments */
if (cmd->use_sg != 0) {
+ struct scatterlist *sgl = cmd->request_buffer;
struct scatterlist *cur_seg;
- struct scatterlist *end_seg;
+ int i;

- cur_seg = (struct scatterlist *)cmd->request_buffer;
- end_seg = cur_seg + tot_dsds;
- while (cur_seg < end_seg) {
+ for_each_sg(sgl, cur_seg, tot_dsds, i) {
dma_addr_t sle_dma;
cont_a64_entry_t *cont_pkt;

@@ -696,8 +695,6 @@ qla24xx_build_scsi_iocbs(srb_t *sp, struct cmd_type_7 *cmd_pkt,
*cur_dsd++ = cpu_to_le32(MSD(sle_dma));
*cur_dsd++ = cpu_to_le32(sg_dma_len(cur_seg));
avail_dsds--;
-
- cur_seg++;
}
} else {
*cur_dsd++ = cpu_to_le32(LSD(sp->dma_handle));
diff --git a/drivers/scsi/qla4xxx/ql4_iocb.c b/drivers/scsi/qla4xxx/ql4_iocb.c
index a216a17..82a894b 100644
--- a/drivers/scsi/qla4xxx/ql4_iocb.c
+++ b/drivers/scsi/qla4xxx/ql4_iocb.c
@@ -156,12 +156,11 @@ static void qla4xxx_build_scsi_iocbs(struct srb *srb,

/* Load data segments */
if (cmd->use_sg) {
+ struct scatterlist *sgl = cmd->request_buffer;
struct scatterlist *cur_seg;
- struct scatterlist *end_seg;
+ int i;

- cur_seg = (struct scatterlist *)cmd->request_buffer;
- end_seg = cur_seg + tot_dsds;
- while (cur_seg < end_seg) {
+ for_each_sg(sgl, cur_seg, tot_dsds, i) {
dma_addr_t sle_dma;

/* Allocate additional continuation packets? */
@@ -182,7 +181,6 @@ static void qla4xxx_build_scsi_iocbs(struct srb *srb,
avail_dsds--;

cur_dsd++;
- cur_seg++;
}
} else {
cur_dsd->base.addrLow = cpu_to_le32(LSDW(srb->dma_handle));
diff --git a/drivers/scsi/qlogicfas408.c b/drivers/scsi/qlogicfas408.c
index 2e7db18..ccc7d3f 100644
--- a/drivers/scsi/qlogicfas408.c
+++ b/drivers/scsi/qlogicfas408.c
@@ -315,18 +315,19 @@ static unsigned int ql_pcmd(struct scsi_cmnd *cmd)
ql_pdma(priv, phase, cmd->request_buffer,
cmd->request_bufflen);
else {
+ struct scatterlist *sg;
+
sgcount = cmd->use_sg;
sglist = cmd->request_buffer;
- while (sgcount--) {
+ for_each_sg(sglist, sg, sgcount, i) {
if (priv->qabort) {
REG0;
return ((priv->qabort == 1 ?
DID_ABORT : DID_RESET) << 16);
}
- buf = page_address(sglist->page) + sglist->offset;
- if (ql_pdma(priv, phase, buf, sglist->length))
+ buf = page_address(sg->page) + sg->offset;
+ if (ql_pdma(priv, phase, buf, sg->length))
break;
- sglist++;
}
}
REG0;
diff --git a/drivers/scsi/qlogicpti.c b/drivers/scsi/qlogicpti.c
index c4195ea..e36e6cd 100644
--- a/drivers/scsi/qlogicpti.c
+++ b/drivers/scsi/qlogicpti.c
@@ -868,7 +868,7 @@ static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
struct qlogicpti *qpti, u_int in_ptr, u_int out_ptr)
{
struct dataseg *ds;
- struct scatterlist *sg;
+ struct scatterlist *sg, *s;
int i, n;

if (Cmnd->use_sg) {
@@ -884,11 +884,12 @@ static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
n = sg_count;
if (n > 4)
n = 4;
- for (i = 0; i < n; i++, sg++) {
- ds[i].d_base = sg_dma_address(sg);
- ds[i].d_count = sg_dma_len(sg);
+ for_each_sg(sg, s, n, i) {
+ ds[i].d_base = sg_dma_address(s);
+ ds[i].d_count = sg_dma_len(g);
}
sg_count -= 4;
+ sg = s;
while (sg_count > 0) {
struct Continuation_Entry *cont;

@@ -907,9 +908,9 @@ static inline int load_cmd(struct scsi_cmnd *Cmnd, struct Command_Entry *cmd,
n = sg_count;
if (n > 7)
n = 7;
- for (i = 0; i < n; i++, sg++) {
- ds[i].d_base = sg_dma_address(sg);
- ds[i].d_count = sg_dma_len(sg);
+ for_each_sg(sg, s, n, i) {
+ ds[i].d_base = sg_dma_address(s);
+ ds[i].d_count = sg_dma_len(s);
}
sg_count -= n;
}
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 06229f2..0ef1310 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -38,6 +38,7 @@
#include <linux/proc_fs.h>
#include <linux/vmalloc.h>
#include <linux/moduleparam.h>
+#include <linux/scatterlist.h>

#include <linux/blkdev.h>
#include "scsi.h"
@@ -600,7 +601,7 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
int k, req_len, act_len, len, active;
void * kaddr;
void * kaddr_off;
- struct scatterlist * sgpnt;
+ struct scatterlist * sgpnt, * sg;

if (0 == scp->request_bufflen)
return 0;
@@ -621,14 +622,15 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
}
sgpnt = (struct scatterlist *)scp->request_buffer;
active = 1;
- for (k = 0, req_len = 0, act_len = 0; k < scp->use_sg; ++k, ++sgpnt) {
+ req_len = act_len = 0;
+ for_each_sg(sgpnt, sg, scp->use_sg, k) {
if (active) {
kaddr = (unsigned char *)
- kmap_atomic(sgpnt->page, KM_USER0);
+ kmap_atomic(sg->page, KM_USER0);
if (NULL == kaddr)
return (DID_ERROR << 16);
- kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
- len = sgpnt->length;
+ kaddr_off = (unsigned char *)kaddr + sg->offset;
+ len = sg->length;
if ((req_len + len) > arr_len) {
active = 0;
len = arr_len - req_len;
@@ -637,7 +639,7 @@ static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
kunmap_atomic(kaddr, KM_USER0);
act_len += len;
}
- req_len += sgpnt->length;
+ req_len += sg->length;
}
if (scp->resid)
scp->resid -= act_len;
@@ -653,7 +655,7 @@ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
int k, req_len, len, fin;
void * kaddr;
void * kaddr_off;
- struct scatterlist * sgpnt;
+ struct scatterlist * sg;

if (0 == scp->request_bufflen)
return 0;
@@ -668,13 +670,14 @@ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
memcpy(arr, scp->request_buffer, len);
return len;
}
- sgpnt = (struct scatterlist *)scp->request_buffer;
- for (k = 0, req_len = 0, fin = 0; k < scp->use_sg; ++k, ++sgpnt) {
- kaddr = (unsigned char *)kmap_atomic(sgpnt->page, KM_USER0);
+ sg = (struct scatterlist *)scp->request_buffer;
+ req_len = fin = 0;
+ for (k = 0; k < scp->use_sg; ++k, sg = sg_next(sg)) {
+ kaddr = (unsigned char *)kmap_atomic(sg->page, KM_USER0);
if (NULL == kaddr)
return -1;
- kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
- len = sgpnt->length;
+ kaddr_off = (unsigned char *)kaddr + sg->offset;
+ len = sg->length;
if ((req_len + len) > max_arr_len) {
len = max_arr_len - req_len;
fin = 1;
@@ -683,7 +686,7 @@ static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
kunmap_atomic(kaddr, KM_USER0);
if (fin)
return req_len + len;
- req_len += sgpnt->length;
+ req_len += sg->length;
}
return req_len;
}
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 0c691a6..0d67fa2 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1168,7 +1168,7 @@ sg_vma_nopage(struct vm_area_struct *vma, unsigned long addr, int *type)
sg = rsv_schp->buffer;
sa = vma->vm_start;
for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
- ++k, ++sg) {
+ ++k, sg = sg_next(sg)) {
len = vma->vm_end - sa;
len = (len < sg->length) ? len : sg->length;
if (offset < len) {
@@ -1212,7 +1212,7 @@ sg_mmap(struct file *filp, struct vm_area_struct *vma)
sa = vma->vm_start;
sg = rsv_schp->buffer;
for (k = 0; (k < rsv_schp->k_use_sg) && (sa < vma->vm_end);
- ++k, ++sg) {
+ ++k, sg = sg_next(sg)) {
len = vma->vm_end - sa;
len = (len < sg->length) ? len : sg->length;
sa += len;
@@ -1866,7 +1866,7 @@ sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size)
}
for (k = 0, sg = schp->buffer, rem_sz = blk_size;
(rem_sz > 0) && (k < mx_sc_elems);
- ++k, rem_sz -= ret_sz, ++sg) {
+ ++k, rem_sz -= ret_sz, sg = sg_next(sg)) {

num = (rem_sz > scatter_elem_sz_prev) ?
scatter_elem_sz_prev : rem_sz;
@@ -1939,7 +1939,7 @@ sg_write_xfer(Sg_request * srp)
if (res)
return res;

- for (; p; ++sg, ksglen = sg->length,
+ for (; p; sg = sg_next(sg), ksglen = sg->length,
p = page_address(sg->page)) {
if (usglen <= 0)
break;
@@ -2018,7 +2018,7 @@ sg_remove_scat(Sg_scatter_hold * schp)
int k;

for (k = 0; (k < schp->k_use_sg) && sg->page;
- ++k, ++sg) {
+ ++k, sg = sg_next(sg)) {
SCSI_LOG_TIMEOUT(5, printk(
"sg_remove_scat: k=%d, pg=0x%p, len=%d\n",
k, sg->page, sg->length));
@@ -2071,7 +2071,7 @@ sg_read_xfer(Sg_request * srp)
if (res)
return res;

- for (; p; ++sg, ksglen = sg->length,
+ for (; p; sg = sg_next(sg), ksglen = sg->length,
p = page_address(sg->page)) {
if (usglen <= 0)
break;
@@ -2118,7 +2118,7 @@ sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer)
if ((!outp) || (num_read_xfer <= 0))
return 0;

- for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, ++sg) {
+ for (k = 0; (k < schp->k_use_sg) && sg->page; ++k, sg = sg_next(sg)) {
num = sg->length;
if (num > num_read_xfer) {
if (__copy_to_user(outp, page_address(sg->page),
@@ -2168,7 +2168,7 @@ sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size)
SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size));
rem = size;

- for (k = 0; k < rsv_schp->k_use_sg; ++k, ++sg) {
+ for (k = 0; k < rsv_schp->k_use_sg; ++k, sg = sg_next(sg)) {
num = sg->length;
if (rem <= num) {
sfp->save_scat_len = num;
diff --git a/drivers/scsi/sym53c416.c b/drivers/scsi/sym53c416.c
index 2ca9505..06c765c 100644
--- a/drivers/scsi/sym53c416.c
+++ b/drivers/scsi/sym53c416.c
@@ -332,7 +332,7 @@ static irqreturn_t sym53c416_intr_handle(int irq, void *dev_id)
int i;
unsigned long flags = 0;
unsigned char status_reg, pio_int_reg, int_reg;
- struct scatterlist *sglist;
+ struct scatterlist *sglist, *sg;
unsigned int sgcount;
unsigned int tot_trans = 0;

@@ -437,11 +437,8 @@ static irqreturn_t sym53c416_intr_handle(int irq, void *dev_id)
{
sgcount = current_command->use_sg;
sglist = current_command->request_buffer;
- while(sgcount--)
- {
- tot_trans += sym53c416_write(base, SG_ADDRESS(sglist), sglist->length);
- sglist++;
- }
+ for_each_sg(sglist, sg, sgcount, i)
+ tot_trans += sym53c416_write(base, SG_ADDRESS(sg), sg->length);
}
if(tot_trans < current_command->underflow)
printk(KERN_WARNING "sym53c416: Underflow, wrote %d bytes, request for %d bytes.\n", tot_trans, current_command->underflow);
diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index 4d78c7e..f39e3ec 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -371,6 +371,7 @@ static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd
segment = sym_scatter_no_sglist(np, cp, cmd);
else if ((use_sg = map_scsi_sg_data(np, cmd)) > 0) {
struct scatterlist *scatter = (struct scatterlist *)cmd->request_buffer;
+ struct scatterlist *sg;
struct sym_tcb *tp = &np->target[cp->target];
struct sym_tblmove *data;

@@ -381,9 +382,9 @@ static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd

data = &cp->phys.data[SYM_CONF_MAX_SG - use_sg];

- for (segment = 0; segment < use_sg; segment++) {
- dma_addr_t baddr = sg_dma_address(&scatter[segment]);
- unsigned int len = sg_dma_len(&scatter[segment]);
+ for_each_sg(scatter, sg, use_sg, segment) {
+ dma_addr_t baddr = sg_dma_address(sg);
+ unsigned int len = sg_dma_len(sg);

if ((len & 1) && (tp->head.wval & EWS)) {
len++;
diff --git a/drivers/scsi/u14-34f.c b/drivers/scsi/u14-34f.c
index 3de08a1..db17ba4 100644
--- a/drivers/scsi/u14-34f.c
+++ b/drivers/scsi/u14-34f.c
@@ -1111,7 +1111,7 @@ static int u14_34f_detect(struct scsi_host_template *tpnt) {
static void map_dma(unsigned int i, unsigned int j) {
unsigned int data_len = 0;
unsigned int k, count, pci_dir;
- struct scatterlist *sgpnt;
+ struct scatterlist *sgpnt, *sg;
struct mscp *cpp;
struct scsi_cmnd *SCpnt;

@@ -1140,10 +1140,10 @@ static void map_dma(unsigned int i, unsigned int j) {
sgpnt = (struct scatterlist *) SCpnt->request_buffer;
count = pci_map_sg(HD(j)->pdev, sgpnt, SCpnt->use_sg, pci_dir);

- for (k = 0; k < count; k++) {
- cpp->sglist[k].address = H2DEV(sg_dma_address(&sgpnt[k]));
- cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(&sgpnt[k]));
- data_len += sgpnt[k].length;
+ for_each_sg(sgpnt, sg, count, k) {
+ cpp->sglist[k].address = H2DEV(sg_dma_address(sg));
+ cpp->sglist[k].num_bytes = H2DEV(sg_dma_len(sg));
+ data_len += sg->length;
}

cpp->sg = TRUE;
diff --git a/drivers/scsi/ultrastor.c b/drivers/scsi/ultrastor.c
index 56906ab..1b721ec 100644
--- a/drivers/scsi/ultrastor.c
+++ b/drivers/scsi/ultrastor.c
@@ -675,16 +675,16 @@ static const char *ultrastor_info(struct Scsi_Host * shpnt)

static inline void build_sg_list(struct mscp *mscp, struct scsi_cmnd *SCpnt)
{
- struct scatterlist *sl;
+ struct scatterlist *sl, *sg;
long transfer_length = 0;
int i, max;

sl = (struct scatterlist *) SCpnt->request_buffer;
max = SCpnt->use_sg;
- for (i = 0; i < max; i++) {
- mscp->sglist[i].address = isa_page_to_bus(sl[i].page) + sl[i].offset;
- mscp->sglist[i].num_bytes = sl[i].length;
- transfer_length += sl[i].length;
+ for_each_sg(sl, sg, max, i) {
+ mscp->sglist[i].address = isa_page_to_bus(sg->page) + sg->offset;
+ mscp->sglist[i].num_bytes = sg->length;
+ transfer_length += sg->length;
}
mscp->number_of_sg_list = max;
mscp->transfer_data = isa_virt_to_bus(mscp->sglist);
diff --git a/drivers/scsi/wd7000.c b/drivers/scsi/wd7000.c
index 30be765..85aaa5e 100644
--- a/drivers/scsi/wd7000.c
+++ b/drivers/scsi/wd7000.c
@@ -1108,6 +1108,7 @@ static int wd7000_queuecommand(struct scsi_cmnd *SCpnt,

if (SCpnt->use_sg) {
struct scatterlist *sg = (struct scatterlist *) SCpnt->request_buffer;
+ struct scatterlist *s;
unsigned i;

if (SCpnt->device->host->sg_tablesize == SG_NONE) {
@@ -1120,9 +1121,9 @@ static int wd7000_queuecommand(struct scsi_cmnd *SCpnt,
any2scsi(scb->dataptr, (int) sgb);
any2scsi(scb->maxlen, SCpnt->use_sg * sizeof(Sgb));

- for (i = 0; i < SCpnt->use_sg; i++) {
- any2scsi(sgb[i].ptr, isa_page_to_bus(sg[i].page) + sg[i].offset);
- any2scsi(sgb[i].len, sg[i].length);
+ for_each_sg(sg, s, SCpnt->use_sg, i) {
+ any2scsi(sgb[i].ptr, isa_page_to_bus(s->page) + s->offset);
+ any2scsi(sgb[i].len, s->length);
}
} else {
scb->op = 0;
diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c
index 4d3cbb1..8d3711a 100644
--- a/drivers/usb/storage/alauda.c
+++ b/drivers/usb/storage/alauda.c
@@ -798,12 +798,13 @@ static int alauda_read_data(struct us_data *us, unsigned long address,
{
unsigned char *buffer;
u16 lba, max_lba;
- unsigned int page, len, index, offset;
+ unsigned int page, len, offset;
unsigned int blockshift = MEDIA_INFO(us).blockshift;
unsigned int pageshift = MEDIA_INFO(us).pageshift;
unsigned int blocksize = MEDIA_INFO(us).blocksize;
unsigned int pagesize = MEDIA_INFO(us).pagesize;
unsigned int uzonesize = MEDIA_INFO(us).uzonesize;
+ struct scatterlist *sg;
int result;

/*
@@ -827,7 +828,8 @@ static int alauda_read_data(struct us_data *us, unsigned long address,
max_lba = MEDIA_INFO(us).capacity >> (blockshift + pageshift);

result = USB_STOR_TRANSPORT_GOOD;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;

while (sectors > 0) {
unsigned int zone = lba / uzonesize; /* integer division */
@@ -873,7 +875,7 @@ static int alauda_read_data(struct us_data *us, unsigned long address,

/* Store the data in the transfer buffer */
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, TO_XFER_BUF);
+ &sg, &offset, TO_XFER_BUF);

page = 0;
lba++;
@@ -891,11 +893,12 @@ static int alauda_write_data(struct us_data *us, unsigned long address,
unsigned int sectors)
{
unsigned char *buffer, *blockbuffer;
- unsigned int page, len, index, offset;
+ unsigned int page, len, offset;
unsigned int blockshift = MEDIA_INFO(us).blockshift;
unsigned int pageshift = MEDIA_INFO(us).pageshift;
unsigned int blocksize = MEDIA_INFO(us).blocksize;
unsigned int pagesize = MEDIA_INFO(us).pagesize;
+ struct scatterlist *sg;
u16 lba, max_lba;
int result;

@@ -929,7 +932,8 @@ static int alauda_write_data(struct us_data *us, unsigned long address,
max_lba = MEDIA_INFO(us).capacity >> (pageshift + blockshift);

result = USB_STOR_TRANSPORT_GOOD;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;

while (sectors > 0) {
/* Write as many sectors as possible in this block */
@@ -946,7 +950,7 @@ static int alauda_write_data(struct us_data *us, unsigned long address,

/* Get the data from the transfer buffer */
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, FROM_XFER_BUF);
+ &sg, &offset, FROM_XFER_BUF);

result = alauda_write_lba(us, lba, page, pages, buffer,
blockbuffer);
diff --git a/drivers/usb/storage/datafab.c b/drivers/usb/storage/datafab.c
index c87ad1b..579e9f5 100644
--- a/drivers/usb/storage/datafab.c
+++ b/drivers/usb/storage/datafab.c
@@ -98,7 +98,8 @@ static int datafab_read_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;

// we're working in LBA mode. according to the ATA spec,
// we can support up to 28-bit addressing. I don't know if Datafab
@@ -155,7 +156,7 @@ static int datafab_read_data(struct us_data *us,

// Store the data in the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, TO_XFER_BUF);
+ &sg, &sg_offset, TO_XFER_BUF);

sector += thistime;
totallen -= len;
@@ -181,7 +182,8 @@ static int datafab_write_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;

// we're working in LBA mode. according to the ATA spec,
// we can support up to 28-bit addressing. I don't know if Datafab
@@ -217,7 +219,7 @@ static int datafab_write_data(struct us_data *us,

// Get the data from the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, FROM_XFER_BUF);
+ &sg, &sg_offset, FROM_XFER_BUF);

command[0] = 0;
command[1] = thistime;
diff --git a/drivers/usb/storage/jumpshot.c b/drivers/usb/storage/jumpshot.c
index 003fcf5..61097cb 100644
--- a/drivers/usb/storage/jumpshot.c
+++ b/drivers/usb/storage/jumpshot.c
@@ -119,7 +119,8 @@ static int jumpshot_read_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;

// we're working in LBA mode. according to the ATA spec,
// we can support up to 28-bit addressing. I don't know if Jumpshot
@@ -170,7 +171,7 @@ static int jumpshot_read_data(struct us_data *us,

// Store the data in the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, TO_XFER_BUF);
+ &sg, &sg_offset, TO_XFER_BUF);

sector += thistime;
totallen -= len;
@@ -195,7 +196,8 @@ static int jumpshot_write_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result, waitcount;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;

// we're working in LBA mode. according to the ATA spec,
// we can support up to 28-bit addressing. I don't know if Jumpshot
@@ -225,7 +227,7 @@ static int jumpshot_write_data(struct us_data *us,

// Get the data from the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, FROM_XFER_BUF);
+ &sg, &sg_offset, FROM_XFER_BUF);

command[0] = 0;
command[1] = thistime;
diff --git a/drivers/usb/storage/protocol.c b/drivers/usb/storage/protocol.c
index 9ad3042..cc8f7c5 100644
--- a/drivers/usb/storage/protocol.c
+++ b/drivers/usb/storage/protocol.c
@@ -157,7 +157,7 @@ void usb_stor_transparent_scsi_command(struct scsi_cmnd *srb,
* pick up from where this one left off. */

unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
- unsigned int buflen, struct scsi_cmnd *srb, unsigned int *index,
+ unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **sgptr,
unsigned int *offset, enum xfer_buf_dir dir)
{
unsigned int cnt;
@@ -184,16 +184,17 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
* located in high memory -- then kmap() will map it to a temporary
* position in the kernel's virtual address space. */
} else {
- struct scatterlist *sg =
- (struct scatterlist *) srb->request_buffer
- + *index;
+ struct scatterlist *sg = *sgptr;
+
+ if (!sg)
+ sg = (struct scatterlist *) srb->request_buffer;

/* This loop handles a single s-g list entry, which may
* include multiple pages. Find the initial page structure
* and the starting offset within the page, and update
* the *offset and *index values for the next loop. */
cnt = 0;
- while (cnt < buflen && *index < srb->use_sg) {
+ while (cnt < buflen) {
struct page *page = sg->page +
((sg->offset + *offset) >> PAGE_SHIFT);
unsigned int poff =
@@ -209,8 +210,7 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,

/* Transfer continues to next s-g entry */
*offset = 0;
- ++*index;
- ++sg;
+ sg = sg_next(sg);
}

/* Transfer the data for all the pages in this
@@ -234,6 +234,7 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
sglen -= plen;
}
}
+ *sgptr = sg;
}

/* Return the amount actually transferred */
@@ -245,9 +246,10 @@ unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
void usb_stor_set_xfer_buf(unsigned char *buffer,
unsigned int buflen, struct scsi_cmnd *srb)
{
- unsigned int index = 0, offset = 0;
+ unsigned int offset = 0;
+ struct scatterlist *sg = NULL;

- usb_stor_access_xfer_buf(buffer, buflen, srb, &index, &offset,
+ usb_stor_access_xfer_buf(buffer, buflen, srb, &sg, &offset,
TO_XFER_BUF);
if (buflen < srb->request_bufflen)
srb->resid = srb->request_bufflen - buflen;
diff --git a/drivers/usb/storage/protocol.h b/drivers/usb/storage/protocol.h
index 845bed4..8737a36 100644
--- a/drivers/usb/storage/protocol.h
+++ b/drivers/usb/storage/protocol.h
@@ -52,7 +52,7 @@ extern void usb_stor_transparent_scsi_command(struct scsi_cmnd*,
enum xfer_buf_dir {TO_XFER_BUF, FROM_XFER_BUF};

extern unsigned int usb_stor_access_xfer_buf(unsigned char *buffer,
- unsigned int buflen, struct scsi_cmnd *srb, unsigned int *index,
+ unsigned int buflen, struct scsi_cmnd *srb, struct scatterlist **,
unsigned int *offset, enum xfer_buf_dir dir);

extern void usb_stor_set_xfer_buf(unsigned char *buffer,
diff --git a/drivers/usb/storage/sddr09.c b/drivers/usb/storage/sddr09.c
index b2ed2a3..b12202c 100644
--- a/drivers/usb/storage/sddr09.c
+++ b/drivers/usb/storage/sddr09.c
@@ -705,7 +705,8 @@ sddr09_read_data(struct us_data *us,
unsigned char *buffer;
unsigned int lba, maxlba, pba;
unsigned int page, pages;
- unsigned int len, index, offset;
+ unsigned int len, offset;
+ struct scatterlist *sg;
int result;

// Figure out the initial LBA and page
@@ -730,7 +731,8 @@ sddr09_read_data(struct us_data *us,
// contiguous LBA's. Another exercise left to the student.

result = 0;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;

while (sectors > 0) {

@@ -777,7 +779,7 @@ sddr09_read_data(struct us_data *us,

// Store the data in the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, TO_XFER_BUF);
+ &sg, &offset, TO_XFER_BUF);

page = 0;
lba++;
@@ -931,7 +933,8 @@ sddr09_write_data(struct us_data *us,
unsigned int pagelen, blocklen;
unsigned char *blockbuffer;
unsigned char *buffer;
- unsigned int len, index, offset;
+ unsigned int len, offset;
+ struct scatterlist *sg;
int result;

// Figure out the initial LBA and page
@@ -968,7 +971,8 @@ sddr09_write_data(struct us_data *us,
}

result = 0;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;

while (sectors > 0) {

@@ -987,7 +991,7 @@ sddr09_write_data(struct us_data *us,

// Get the data from the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, FROM_XFER_BUF);
+ &sg, &offset, FROM_XFER_BUF);

result = sddr09_write_lba(us, lba, page, pages,
buffer, blockbuffer);
diff --git a/drivers/usb/storage/sddr55.c b/drivers/usb/storage/sddr55.c
index 0b1b5b5..d43a341 100644
--- a/drivers/usb/storage/sddr55.c
+++ b/drivers/usb/storage/sddr55.c
@@ -167,7 +167,8 @@ static int sddr55_read_data(struct us_data *us,
unsigned long address;

unsigned short pages;
- unsigned int len, index, offset;
+ unsigned int len, offset;
+ struct scatterlist *sg;

// Since we only read in one block at a time, we have to create
// a bounce buffer and move the data a piece at a time between the
@@ -178,7 +179,8 @@ static int sddr55_read_data(struct us_data *us,
buffer = kmalloc(len, GFP_NOIO);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR; /* out of memory */
- index = offset = 0;
+ offset = 0;
+ sg = NULL;

while (sectors>0) {

@@ -255,7 +257,7 @@ static int sddr55_read_data(struct us_data *us,

// Store the data in the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, TO_XFER_BUF);
+ &sg, &offset, TO_XFER_BUF);

page = 0;
lba++;
@@ -287,7 +289,8 @@ static int sddr55_write_data(struct us_data *us,

unsigned short pages;
int i;
- unsigned int len, index, offset;
+ unsigned int len, offset;
+ struct scatterlist *sg;

/* check if we are allowed to write */
if (info->read_only || info->force_read_only) {
@@ -304,7 +307,8 @@ static int sddr55_write_data(struct us_data *us,
buffer = kmalloc(len, GFP_NOIO);
if (buffer == NULL)
return USB_STOR_TRANSPORT_ERROR;
- index = offset = 0;
+ offset = 0;
+ sg = NULL;

while (sectors > 0) {

@@ -322,7 +326,7 @@ static int sddr55_write_data(struct us_data *us,

// Get the data from the transfer buffer
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &index, &offset, FROM_XFER_BUF);
+ &sg, &offset, FROM_XFER_BUF);

US_DEBUGP("Write %02X pages, to PBA %04X"
" (LBA %04X) page %02X\n",
diff --git a/drivers/usb/storage/shuttle_usbat.c b/drivers/usb/storage/shuttle_usbat.c
index 5e27297..a0ff394 100644
--- a/drivers/usb/storage/shuttle_usbat.c
+++ b/drivers/usb/storage/shuttle_usbat.c
@@ -996,7 +996,8 @@ static int usbat_flash_read_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;

result = usbat_flash_check_media(us, info);
if (result != USB_STOR_TRANSPORT_GOOD)
@@ -1050,7 +1051,7 @@ static int usbat_flash_read_data(struct us_data *us,

/* Store the data in the transfer buffer */
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, TO_XFER_BUF);
+ &sg, &sg_offset, TO_XFER_BUF);

sector += thistime;
totallen -= len;
@@ -1086,7 +1087,8 @@ static int usbat_flash_write_data(struct us_data *us,
unsigned char thistime;
unsigned int totallen, alloclen;
int len, result;
- unsigned int sg_idx = 0, sg_offset = 0;
+ unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;

result = usbat_flash_check_media(us, info);
if (result != USB_STOR_TRANSPORT_GOOD)
@@ -1125,7 +1127,7 @@ static int usbat_flash_write_data(struct us_data *us,

/* Get the data from the transfer buffer */
usb_stor_access_xfer_buf(buffer, len, us->srb,
- &sg_idx, &sg_offset, FROM_XFER_BUF);
+ &sg, &sg_offset, FROM_XFER_BUF);

/* ATA command 0x30 (WRITE SECTORS) */
usbat_pack_ata_sector_cmd(command, thistime, sector, 0x30);
@@ -1165,8 +1167,8 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,
unsigned char *buffer;
unsigned int len;
unsigned int sector;
- unsigned int sg_segment = 0;
unsigned int sg_offset = 0;
+ struct scatterlist *sg = NULL;

US_DEBUGP("handle_read10: transfersize %d\n",
srb->transfersize);
@@ -1223,9 +1225,6 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,
sector |= short_pack(data[7+5], data[7+4]);
transferred = 0;

- sg_segment = 0; /* for keeping track of where we are in */
- sg_offset = 0; /* the scatter/gather list */
-
while (transferred != srb->request_bufflen) {

if (len > srb->request_bufflen - transferred)
@@ -1258,7 +1257,7 @@ static int usbat_hp8200e_handle_read10(struct us_data *us,

/* Store the data in the transfer buffer */
usb_stor_access_xfer_buf(buffer, len, srb,
- &sg_segment, &sg_offset, TO_XFER_BUF);
+ &sg, &sg_offset, TO_XFER_BUF);

/* Update the amount transferred and the sector number */

diff --git a/include/linux/i2o.h b/include/linux/i2o.h
index 52f53e2..0ae1dcf 100644
--- a/include/linux/i2o.h
+++ b/include/linux/i2o.h
@@ -836,7 +836,7 @@ static inline int i2o_dma_map_sg(struct i2o_controller *c,
if ((sizeof(dma_addr_t) > 4) && c->pae_support)
*mptr++ = cpu_to_le32(i2o_dma_high(sg_dma_address(sg)));
#endif
- sg++;
+ sg = sg_next(sg);
}
*sg_ptr = mptr;

diff --git a/include/linux/ide.h b/include/linux/ide.h
index 07aba87..fe81b05 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -764,7 +764,7 @@ typedef struct hwif_s {

unsigned int nsect;
unsigned int nleft;
- unsigned int cursg;
+ struct scatterlist *cursg;
unsigned int cursg_ofs;

int rqsize; /* max sectors per request */
-
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