[PATCH] 2.5.40 s390 (9/27): bottom half removal.

From: Martin Schwidefsky (schwidefsky@de.ibm.com)
Date: Fri Oct 04 2002 - 09:28:12 EST


Replace IMMEDIATE_BH bottom half by tasklets in 3215, ctc and iucv driver.

diff -urN linux-2.5.40/drivers/s390/char/con3215.c linux-2.5.40-s390/drivers/s390/char/con3215.c
--- linux-2.5.40/drivers/s390/char/con3215.c Tue Oct 1 09:06:18 2002
+++ linux-2.5.40-s390/drivers/s390/char/con3215.c Fri Oct 4 16:15:21 2002
@@ -89,7 +89,7 @@
         int written; /* number of bytes in write requests */
         devstat_t devstat; /* device status structure for do_IO */
         struct tty_struct *tty; /* pointer to tty structure if present */
- struct tq_struct tqueue; /* task queue to bottom half */
+ struct tasklet_struct tasklet;
         raw3215_req *queued_read; /* pointer to queued read requests */
         raw3215_req *queued_write; /* pointer to queued write requests */
         wait_queue_head_t empty_wait; /* wait queue for flushing */
@@ -341,7 +341,7 @@
  * The bottom half handler routine for 3215 devices. It tries to start
  * the next IO and wakes up processes waiting on the tty.
  */
-static void raw3215_softint(void *data)
+static void raw3215_tasklet(void *data)
 {
         raw3215_info *raw;
         struct tty_struct *tty;
@@ -377,12 +377,7 @@
         if (raw->flags & RAW3215_BH_PENDING)
                 return; /* already pending */
         raw->flags |= RAW3215_BH_PENDING;
- INIT_LIST_HEAD(&raw->tqueue.list);
- raw->tqueue.sync = 0;
- raw->tqueue.routine = raw3215_softint;
- raw->tqueue.data = raw;
- queue_task(&raw->tqueue, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_hi_schedule(&raw->tasklet);
 }
 
 /*
@@ -867,8 +862,9 @@
                         kfree(raw);
                         return -ENOMEM;
                 }
- raw->tqueue.routine = raw3215_softint;
- raw->tqueue.data = raw;
+ tasklet_init(&raw->tasklet,
+ (void (*)(unsigned long)) raw3215_tasklet,
+ (unsigned long) raw);
                 init_waitqueue_head(&raw->empty_wait);
                 raw3215[line] = raw;
         }
@@ -1095,10 +1091,11 @@
         raw->inbuf = (char *) alloc_bootmem_low(RAW3215_INBUF_SIZE);
 
         /* Find the first console */
- raw->irq = raw3215_find_dev(0);
+ raw->irq = irq;
         raw->flags |= RAW3215_FIXED;
- raw->tqueue.routine = raw3215_softint;
- raw->tqueue.data = raw;
+ tasklet_init(&raw->tasklet,
+ (void (*)(unsigned long)) raw3215_tasklet,
+ (unsigned long) raw);
         init_waitqueue_head(&raw->empty_wait);
 
         /* Request the console irq */
diff -urN linux-2.5.40/drivers/s390/char/tubfs.c linux-2.5.40-s390/drivers/s390/char/tubfs.c
--- linux-2.5.40/drivers/s390/char/tubfs.c Tue Oct 1 09:07:06 2002
+++ linux-2.5.40-s390/drivers/s390/char/tubfs.c Fri Oct 4 16:15:21 2002
@@ -229,12 +229,12 @@
  * fs3270_bh(tubp) -- Perform back-half processing
  */
 static void
-fs3270_bh(void *data)
+fs3270_tasklet(unsigned long data)
 {
         long flags;
         tub_t *tubp;
 
- tubp = data;
+ tubp = (tub_t *) data;
         TUBLOCK(tubp->irq, flags);
         tubp->flags &= ~TUB_BHPENDING;
 
@@ -265,10 +265,9 @@
         if (tubp->flags & TUB_BHPENDING)
                 return;
         tubp->flags |= TUB_BHPENDING;
- tubp->tqueue.routine = fs3270_bh;
- tubp->tqueue.data = tubp;
- queue_task(&tubp->tqueue, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_init(&tubp->tasklet, fs3270_tasklet,
+ (unsigned long) tubp);
+ tasklet_schedule(&tubp->tasklet);
 }
 
 /*
diff -urN linux-2.5.40/drivers/s390/char/tubio.h linux-2.5.40-s390/drivers/s390/char/tubio.h
--- linux-2.5.40/drivers/s390/char/tubio.h Tue Oct 1 09:05:46 2002
+++ linux-2.5.40-s390/drivers/s390/char/tubio.h Fri Oct 4 16:15:21 2002
@@ -234,7 +234,7 @@
         enum tubstat stat;
         enum tubcmd cmd;
         int flags; /* See below for values */
- struct tq_struct tqueue;
+ struct tasklet_struct tasklet;
 
         /* Stuff for fs-driver support */
         pid_t fs_pid; /* Pid if TBM_FS */
diff -urN linux-2.5.40/drivers/s390/char/tubtty.c linux-2.5.40-s390/drivers/s390/char/tubtty.c
--- linux-2.5.40/drivers/s390/char/tubtty.c Tue Oct 1 09:07:35 2002
+++ linux-2.5.40-s390/drivers/s390/char/tubtty.c Fri Oct 4 16:15:21 2002
@@ -35,7 +35,7 @@
         unsigned long, void *);
 
 /* tty3270 utility functions */
-static void tty3270_bh(void *);
+static void tty3270_tasklet(unsigned long);
        void tty3270_sched_bh(tub_t *);
 static int tty3270_wait(tub_t *, long *);
        void tty3270_int(tub_t *, devstat_t *);
@@ -598,17 +598,18 @@
 
 
 /*
- * tty3270_bh(tubp) -- Perform back-half processing
+ * tty3270_tasklet(tubp) -- Perform back-half processing
  */
 static void
-tty3270_bh(void *data)
+tty3270_tasklet(unsigned long data)
 {
         tub_t *tubp;
         ioinfo_t *ioinfop;
         long flags;
         struct tty_struct *tty;
 
- ioinfop = ioinfo[(tubp = data)->irq];
+ tubp = (tub_t *) data;
+ ioinfop = ioinfo[tubp->irq];
         while (TUBTRYLOCK(tubp->irq, flags) == 0) {
                 if (ioinfop->ui.flags.unready == 1)
                         return;
@@ -663,10 +664,9 @@
         if (tubp->flags & TUB_BHPENDING)
                 return;
         tubp->flags |= TUB_BHPENDING;
- tubp->tqueue.routine = tty3270_bh;
- tubp->tqueue.data = tubp;
- queue_task(&tubp->tqueue, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_init(&tubp->tasklet, tty3270_tasklet,
+ (unsigned long) tubp);
+ tasklet_schedule(&tubp->tasklet);
 }
 
 /*
diff -urN linux-2.5.40/drivers/s390/net/ctctty.c linux-2.5.40-s390/drivers/s390/net/ctctty.c
--- linux-2.5.40/drivers/s390/net/ctctty.c Fri Oct 4 16:14:52 2002
+++ linux-2.5.40-s390/drivers/s390/net/ctctty.c Fri Oct 4 16:15:21 2002
@@ -86,7 +86,7 @@
   wait_queue_head_t open_wait;
   wait_queue_head_t close_wait;
   struct semaphore write_sem;
- struct tq_struct tq;
+ struct tasklet_struct tasklet;
   struct timer_list stoptimer;
 } ctc_tty_info;
 
@@ -272,8 +272,7 @@
          */
         skb_queue_tail(&info->rx_queue, skb);
         /* Schedule dequeuing */
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
 }
 
 static int
@@ -390,8 +389,7 @@
         skb_reserve(skb, skb_res);
         *(skb_put(skb, 1)) = c;
         skb_queue_head(&info->tx_queue, skb);
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
 }
 
 static void
@@ -400,8 +398,7 @@
         if (ctc_tty_shuttingdown)
                 return;
         info->flags |= CTC_ASYNC_TX_LINESTAT;
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
 }
 
 static void
@@ -562,8 +559,7 @@
         }
         if (skb_queue_len(&info->tx_queue)) {
                 info->lsr &= ~UART_LSR_TEMT;
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
         }
         if (from_user)
                 up(&info->write_sem);
@@ -624,8 +620,7 @@
                 return;
         if (tty->stopped || tty->hw_stopped || (!skb_queue_len(&info->tx_queue)))
                 return;
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
 }
 
 /*
@@ -1161,8 +1156,9 @@
  * the lower levels.
  */
 static void
-ctc_tty_task(ctc_tty_info *info)
+ctc_tty_task(unsigned long arg)
 {
+ ctc_tty_info *info = (void *)arg;
         unsigned long saveflags;
         int again;
 
@@ -1173,8 +1169,7 @@
                         info->lsr |= UART_LSR_TEMT;
                 again |= ctc_tty_readmodem(info);
                 if (again) {
- queue_task(&info->tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
+ tasklet_schedule(&info->tasklet);
                 }
         }
         spin_unlock_irqrestore(&ctc_tty_lock, saveflags);
@@ -1234,14 +1229,8 @@
         for (i = 0; i < CTC_TTY_MAX_DEVICES; i++) {
                 info = &driver->info[i];
                 init_MUTEX(&info->write_sem);
-#if LINUX_VERSION_CODE >= 0x020400
- INIT_LIST_HEAD(&info->tq.list);
-#else
- info->tq.next = NULL;
-#endif
- info->tq.sync = 0;
- info->tq.routine = (void *)(void *)ctc_tty_task;
- info->tq.data = info;
+ tasklet_init(&info->tasklet, ctc_tty_task,
+ (unsigned long) info);
                 info->magic = CTC_ASYNC_MAGIC;
                 info->line = i;
                 info->tty = 0;
@@ -1322,10 +1311,6 @@
                 kfree(driver);
                 driver = NULL;
         } else {
- int i;
-
- for (i = 0; i < CTC_TTY_MAX_DEVICES; i++)
- driver->info[i].tq.routine = NULL;
                 tty_unregister_driver(&driver->ctc_tty_device);
         }
         spin_unlock_irqrestore(&ctc_tty_lock, saveflags);
diff -urN linux-2.5.40/drivers/s390/net/iucv.c linux-2.5.40-s390/drivers/s390/net/iucv.c
--- linux-2.5.40/drivers/s390/net/iucv.c Fri Oct 4 16:14:52 2002
+++ linux-2.5.40-s390/drivers/s390/net/iucv.c Fri Oct 4 16:15:21 2002
@@ -41,9 +41,9 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/init.h>
-#include <linux/tqueue.h>
 #include <linux/interrupt.h>
 #include <linux/list.h>
+#include <linux/errno.h>
 #include <asm/atomic.h>
 #include "iucv.h"
 #include <asm/io.h>
@@ -99,16 +99,14 @@
 static struct list_head iucv_irq_queue;
 static spinlock_t iucv_irq_queue_lock = SPIN_LOCK_UNLOCKED;
 
-static struct tq_struct iucv_tq;
-
-static atomic_t iucv_bh_scheduled = ATOMIC_INIT (0);
-
 /*
  *Internal function prototypes
  */
-static void iucv_bh_handler(void);
+static void iucv_tasklet_handler(unsigned long);
 static void iucv_irq_handler(struct pt_regs *, __u16);
 
+static DECLARE_TASKLET(iucv_tasklet,iucv_tasklet_handler,0);
+
 /************ FUNCTION ID'S ****************************/
 
 #define ACCEPT 10
@@ -385,11 +383,6 @@
         }
         memset(iucv_param_pool, 0, sizeof(iucv_param) * PARAM_POOL_SIZE);
 
- /* Initialize task queue */
- INIT_LIST_HEAD(&iucv_tq.list);
- iucv_tq.sync = 0;
- iucv_tq.routine = (void *)iucv_bh_handler;
-
         /* Initialize irq queue */
         INIT_LIST_HEAD(&iucv_irq_queue);
 
@@ -2177,7 +2170,7 @@
  * @code: irq code
  *
  * Handles external interrupts coming in from CP.
- * Places the interrupt buffer on a queue and schedules iucv_bh_handler().
+ * Places the interrupt buffer on a queue and schedules iucv_tasklet_handler().
  */
 static void
 iucv_irq_handler(struct pt_regs *regs, __u16 code)
@@ -2200,10 +2193,7 @@
         list_add_tail(&irqdata->queue, &iucv_irq_queue);
         spin_unlock(&iucv_irq_queue_lock);
 
- if (atomic_compare_and_swap (0, 1, &iucv_bh_scheduled) == 0) {
- queue_task (&iucv_tq, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
- }
+ tasklet_schedule(&iucv_tasklet);
 
         irq_exit();
         return;
@@ -2214,7 +2204,7 @@
  * @int_buf: Pointer to copy of external interrupt buffer
  *
  * The workhorse for handling interrupts queued by iucv_irq_handler().
- * This function is called from the bottom half iucv_bh_handler().
+ * This function is called from the bottom half iucv_tasklet_handler().
  */
 static void
 iucv_do_int(iucv_GeneralInterrupt * int_buf)
@@ -2384,20 +2374,18 @@
 }
 
 /**
- * iucv_bh_handler:
+ * iucv_tasklet_handler:
  *
  * This function loops over the queue of irq buffers and runs iucv_do_int()
  * on every queue element.
  */
 static void
-iucv_bh_handler(void)
+iucv_tasklet_handler(unsigned long ignored)
 {
         struct list_head head;
         struct list_head *next;
         ulong flags;
 
- atomic_set(&iucv_bh_scheduled, 0);
-
         spin_lock_irqsave(&iucv_irq_queue_lock, flags);
         list_add(&head, &iucv_irq_queue);
         list_del_init(&iucv_irq_queue);

-
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