[PATCH 2/2] scsi: libsas: Drop SAS_TASK_AT_INITIATOR

From: John Garry
Date: Thu Feb 10 2022 - 05:49:00 EST

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Previous message: John Garry: "[PATCH 1/2] scsi: isci: Drop SAS_TASK_AT_INITIATOR check in isci_task_abort_task()"
In reply to: John Garry: "[PATCH 1/2] scsi: isci: Drop SAS_TASK_AT_INITIATOR check in isci_task_abort_task()"
Next in thread: Damien Le Moal: "Re: [PATCH 2/2] scsi: libsas: Drop SAS_TASK_AT_INITIATOR"
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This flag is now only ever set, so delete it.

This also avoids a use-after-free in the pm8001 queue path, as reported
in the following:
https://lore.kernel.org/linux-scsi/c3cb7228-254e-9584-182b-007ac5e6fe0a@xxxxxxxxxx/T/#m28c94c6d3ff582ec4a9fa54819180740e8bd4cfb
https://lore.kernel.org/linux-scsi/0cc0c435-b4f2-9c76-258d-865ba50a29dd@xxxxxxxxxx/

Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
---
drivers/scsi/aic94xx/aic94xx_task.c | 9 ---------
drivers/scsi/hisi_sas/hisi_sas_main.c | 8 +-------
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c | 3 +--
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 3 +--
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 3 +--
drivers/scsi/isci/request.c | 3 +--
drivers/scsi/isci/task.c | 10 +++-------
drivers/scsi/mvsas/mv_sas.c | 6 +-----
drivers/scsi/pm8001/pm8001_hwi.c | 7 -------
drivers/scsi/pm8001/pm8001_sas.c | 4 ----
drivers/scsi/pm8001/pm80xx_hwi.c | 5 -----
include/scsi/libsas.h | 1 -
12 files changed, 9 insertions(+), 53 deletions(-)

diff --git a/drivers/scsi/aic94xx/aic94xx_task.c b/drivers/scsi/aic94xx/aic94xx_task.c
index c6b63eae28f5..ed119a3f6f2e 100644
--- a/drivers/scsi/aic94xx/aic94xx_task.c
+++ b/drivers/scsi/aic94xx/aic94xx_task.c
@@ -322,7 +322,6 @@ static void asd_task_tasklet_complete(struct asd_ascb *ascb,

spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
task->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
struct completion *completion = ascb->completion;
@@ -532,7 +531,6 @@ int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
struct sas_task *t = task;
struct asd_ascb *ascb = NULL, *a;
struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
- unsigned long flags;

res = asd_can_queue(asd_ha, 1);
if (res)
@@ -575,10 +573,6 @@ int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
}
if (res)
goto out_err_unmap;
-
- spin_lock_irqsave(&t->task_state_lock, flags);
- t->task_state_flags |= SAS_TASK_AT_INITIATOR;
- spin_unlock_irqrestore(&t->task_state_lock, flags);
}
list_del_init(&alist);

@@ -597,9 +591,6 @@ int asd_execute_task(struct sas_task *task, gfp_t gfp_flags)
if (a == b)
break;
t = a->uldd_task;
- spin_lock_irqsave(&t->task_state_lock, flags);
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
- spin_unlock_irqrestore(&t->task_state_lock, flags);
switch (t->task_proto) {
case SAS_PROTOCOL_SATA:
case SAS_PROTOCOL_STP:
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index ebf5ec38891b..1873707ca599 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -405,7 +405,6 @@ void hisi_sas_task_deliver(struct hisi_hba *hisi_hba,
struct hisi_sas_cmd_hdr *cmd_hdr_base;
int dlvry_queue_slot, dlvry_queue;
struct sas_task *task = slot->task;
- unsigned long flags;
int wr_q_index;

spin_lock(&dq->lock);
@@ -457,10 +456,6 @@ void hisi_sas_task_deliver(struct hisi_hba *hisi_hba,
break;
}

- spin_lock_irqsave(&task->task_state_lock, flags);
- task->task_state_flags |= SAS_TASK_AT_INITIATOR;
- spin_unlock_irqrestore(&task->task_state_lock, flags);
-
WRITE_ONCE(slot->ready, 1);

spin_lock(&dq->lock);
@@ -1035,8 +1030,7 @@ static void hisi_sas_do_release_task(struct hisi_hba *hisi_hba, struct sas_task
ts->resp = SAS_TASK_COMPLETE;
ts->stat = SAS_ABORTED_TASK;
spin_lock_irqsave(&task->task_state_lock, flags);
- task->task_state_flags &=
- ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
+ task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
if (!slot->is_internal && task->task_proto != SAS_PROTOCOL_SMP)
task->task_state_flags |= SAS_TASK_STATE_DONE;
spin_unlock_irqrestore(&task->task_state_lock, flags);
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
index 3059d19e4368..6914e992a02e 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
@@ -1200,8 +1200,7 @@ static void slot_complete_v1_hw(struct hisi_hba *hisi_hba,
sas_dev = device->lldd_dev;

spin_lock_irqsave(&task->task_state_lock, flags);
- task->task_state_flags &=
- ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
+ task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
task->task_state_flags |= SAS_TASK_STATE_DONE;
spin_unlock_irqrestore(&task->task_state_lock, flags);

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 64ed3e472e65..eaaf9e8b4ca4 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -2344,8 +2344,7 @@ static void slot_complete_v2_hw(struct hisi_hba *hisi_hba,
sas_dev = device->lldd_dev;

spin_lock_irqsave(&task->task_state_lock, flags);
- task->task_state_flags &=
- ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
+ task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
spin_unlock_irqrestore(&task->task_state_lock, flags);

memset(ts, 0, sizeof(*ts));
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index a01a3a7b706b..52e306c1ece2 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -2217,8 +2217,7 @@ static void slot_complete_v3_hw(struct hisi_hba *hisi_hba,
sas_dev = device->lldd_dev;

spin_lock_irqsave(&task->task_state_lock, flags);
- task->task_state_flags &=
- ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
+ task->task_state_flags &= ~SAS_TASK_STATE_PENDING ;
spin_unlock_irqrestore(&task->task_state_lock, flags);

memset(ts, 0, sizeof(*ts));
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index b48ec64f745a..b45e4e81dd19 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -2934,8 +2934,7 @@ static void isci_request_io_request_complete(struct isci_host *ihost,
if (test_bit(IREQ_COMPLETE_IN_TARGET, &request->flags)) {
/* Normal notification (task_done) */
task->task_state_flags |= SAS_TASK_STATE_DONE;
- task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
- SAS_TASK_STATE_PENDING);
+ task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
}
spin_unlock_irqrestore(&task->task_state_lock, task_flags);

diff --git a/drivers/scsi/isci/task.c b/drivers/scsi/isci/task.c
index 14738702d4c9..c82d07978532 100644
--- a/drivers/scsi/isci/task.c
+++ b/drivers/scsi/isci/task.c
@@ -91,8 +91,7 @@ static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task,

/* Normal notification (task_done) */
task->task_state_flags |= SAS_TASK_STATE_DONE;
- task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
- SAS_TASK_STATE_PENDING);
+ task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
task->lldd_task = NULL;
spin_unlock_irqrestore(&task->task_state_lock, flags);

@@ -164,7 +163,6 @@ int isci_task_execute_task(struct sas_task *task, gfp_t gfp_flags)
} else {
struct isci_request *ireq;

- task->task_state_flags |= SAS_TASK_AT_INITIATOR;
/* do common allocation and init of request object. */
ireq = isci_io_request_from_tag(ihost, task, tag);
spin_unlock_irqrestore(&task->task_state_lock, flags);
@@ -531,8 +529,7 @@ int isci_task_abort_task(struct sas_task *task)
*/
spin_lock_irqsave(&task->task_state_lock, flags);
task->task_state_flags |= SAS_TASK_STATE_DONE;
- task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
- SAS_TASK_STATE_PENDING);
+ task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
spin_unlock_irqrestore(&task->task_state_lock, flags);

ret = TMF_RESP_FUNC_COMPLETE;
@@ -580,8 +577,7 @@ int isci_task_abort_task(struct sas_task *task)
test_bit(IDEV_GONE, &idev->flags));

spin_lock_irqsave(&task->task_state_lock, flags);
- task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
- SAS_TASK_STATE_PENDING);
+ task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
task->task_state_flags |= SAS_TASK_STATE_DONE;
spin_unlock_irqrestore(&task->task_state_lock, flags);

diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index 1e52bc7febfa..a8d1f3dd607a 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -815,9 +815,6 @@ static int mvs_task_prep(struct sas_task *task, struct mvs_info *mvi, int is_tmf
slot->port = tei.port;
task->lldd_task = slot;
list_add_tail(&slot->entry, &tei.port->list);
- spin_lock(&task->task_state_lock);
- task->task_state_flags |= SAS_TASK_AT_INITIATOR;
- spin_unlock(&task->task_state_lock);

mvi_dev->running_req++;
++(*pass);
@@ -1721,8 +1718,7 @@ int mvs_slot_complete(struct mvs_info *mvi, u32 rx_desc, u32 flags)
mvi_dev = dev->lldd_dev;

spin_lock(&task->task_state_lock);
- task->task_state_flags &=
- ~(SAS_TASK_STATE_PENDING | SAS_TASK_AT_INITIATOR);
+ task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
task->task_state_flags |= SAS_TASK_STATE_DONE;
/* race condition*/
aborted = task->task_state_flags & SAS_TASK_STATE_ABORTED;
diff --git a/drivers/scsi/pm8001/pm8001_hwi.c b/drivers/scsi/pm8001/pm8001_hwi.c
index 9ec310b795c3..4683fee87b84 100644
--- a/drivers/scsi/pm8001/pm8001_hwi.c
+++ b/drivers/scsi/pm8001/pm8001_hwi.c
@@ -1561,7 +1561,6 @@ void pm8001_work_fn(struct work_struct *work)
atomic_dec(&pm8001_dev->running_req);
spin_lock_irqsave(&t->task_state_lock, flags1);
t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
t->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
spin_unlock_irqrestore(&t->task_state_lock, flags1);
@@ -2105,7 +2104,6 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
psspPayload->ssp_resp_iu.status);
spin_lock_irqsave(&t->task_state_lock, flags);
t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
t->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
spin_unlock_irqrestore(&t->task_state_lock, flags);
@@ -2273,7 +2271,6 @@ static void mpi_ssp_event(struct pm8001_hba_info *pm8001_ha, void *piomb)
}
spin_lock_irqsave(&t->task_state_lock, flags);
t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
t->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
spin_unlock_irqrestore(&t->task_state_lock, flags);
@@ -2665,7 +2662,6 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
}
spin_lock_irqsave(&t->task_state_lock, flags);
t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
t->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
spin_unlock_irqrestore(&t->task_state_lock, flags);
@@ -3022,7 +3018,6 @@ mpi_smp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
}
spin_lock_irqsave(&t->task_state_lock, flags);
t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
t->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
spin_unlock_irqrestore(&t->task_state_lock, flags);
@@ -3696,7 +3691,6 @@ int pm8001_mpi_task_abort_resp(struct pm8001_hba_info *pm8001_ha, void *piomb)
}
spin_lock_irqsave(&t->task_state_lock, flags);
t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
t->task_state_flags |= SAS_TASK_STATE_DONE;
spin_unlock_irqrestore(&t->task_state_lock, flags);
pm8001_ccb_task_free(pm8001_ha, t, ccb, tag);
@@ -4336,7 +4330,6 @@ static int pm8001_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
ts->resp = SAS_TASK_COMPLETE;
ts->stat = SAS_SAM_STAT_GOOD;
task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
task->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((task->task_state_flags &
SAS_TASK_STATE_ABORTED))) {
diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index 32edda3e55c6..8c12fbb9c476 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -487,9 +487,6 @@ static int pm8001_task_exec(struct sas_task *task,
goto err_out_tag;
}
/* TODO: select normal or high priority */
- spin_lock(&t->task_state_lock);
- t->task_state_flags |= SAS_TASK_AT_INITIATOR;
- spin_unlock(&t->task_state_lock);
} while (0);
rc = 0;
goto out_done;
@@ -983,7 +980,6 @@ void pm8001_open_reject_retry(
atomic_dec(&pm8001_dev->running_req);
spin_lock_irqsave(&task->task_state_lock, flags1);
task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
task->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((task->task_state_flags
& SAS_TASK_STATE_ABORTED))) {
diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
index 9d20f8009b89..b83500ef3d86 100644
--- a/drivers/scsi/pm8001/pm80xx_hwi.c
+++ b/drivers/scsi/pm8001/pm80xx_hwi.c
@@ -2178,7 +2178,6 @@ mpi_ssp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
psspPayload->ssp_resp_iu.status);
spin_lock_irqsave(&t->task_state_lock, flags);
t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
t->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
spin_unlock_irqrestore(&t->task_state_lock, flags);
@@ -2362,7 +2361,6 @@ static void mpi_ssp_event(struct pm8001_hba_info *pm8001_ha, void *piomb)
}
spin_lock_irqsave(&t->task_state_lock, flags);
t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
t->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
spin_unlock_irqrestore(&t->task_state_lock, flags);
@@ -2787,7 +2785,6 @@ mpi_sata_completion(struct pm8001_hba_info *pm8001_ha,
}
spin_lock_irqsave(&t->task_state_lock, flags);
t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
t->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
spin_unlock_irqrestore(&t->task_state_lock, flags);
@@ -3199,7 +3196,6 @@ mpi_smp_completion(struct pm8001_hba_info *pm8001_ha, void *piomb)
}
spin_lock_irqsave(&t->task_state_lock, flags);
t->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
t->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((t->task_state_flags & SAS_TASK_STATE_ABORTED))) {
spin_unlock_irqrestore(&t->task_state_lock, flags);
@@ -4722,7 +4718,6 @@ static int pm80xx_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
ts->resp = SAS_TASK_COMPLETE;
ts->stat = SAS_SAM_STAT_GOOD;
task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
- task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
task->task_state_flags |= SAS_TASK_STATE_DONE;
if (unlikely((task->task_state_flags &
SAS_TASK_STATE_ABORTED))) {
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 698f2032807b..549232d66b40 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -617,7 +617,6 @@ struct sas_task_slow {
#define SAS_TASK_STATE_DONE 2
#define SAS_TASK_STATE_ABORTED 4
#define SAS_TASK_NEED_DEV_RESET 8
-#define SAS_TASK_AT_INITIATOR 16

extern struct sas_task *sas_alloc_task(gfp_t flags);
extern struct sas_task *sas_alloc_slow_task(gfp_t flags);
--
2.26.2

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