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Subject[PATCH] 2.5.34 s390 fixes (10/10): iucv driver.
Date
Hi Linus,
and the last one for today. It replace the iucv bottom half with a tasklet and
corrects the irq_enter()/irq_exit() calls.

blue skies,
Martin.

diff -urN linux-2.5.34/drivers/s390/net/iucv.c linux-2.5.34-s390/drivers/s390/net/iucv.c
--- linux-2.5.34/drivers/s390/net/iucv.c Mon Sep 9 19:35:02 2002
+++ linux-2.5.34-s390/drivers/s390/net/iucv.c Wed Jul 31 16:16:26 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
@@ -302,7 +300,7 @@
if (debuglevel < 3)
return;

- printk(KERN_DEBUG __FUNCTION__ ": %s\n", title);
+ printk(KERN_DEBUG "%s\n", title);
printk(" ");
for (i = 0; i < len; i++) {
if (!(i % 16) && i != 0)
@@ -318,7 +316,7 @@
#define iucv_debug(lvl, fmt, args...) \
do { \
if (debuglevel >= lvl) \
- printk(KERN_DEBUG __FUNCTION__ ": " fmt "\n" , ## args); \
+ printk(KERN_DEBUG "%s: " fmt "\n", __FUNCTION__ , ## args); \
} while (0)

#else
@@ -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);

@@ -2177,20 +2170,19 @@
* @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)
{
iucv_irqdata *irqdata;
- int cpu = smp_processor_id();

- irq_enter(cpu, 0x4000);
+ irq_enter();

irqdata = kmalloc(sizeof(iucv_irqdata), GFP_ATOMIC);
if (!irqdata) {
printk(KERN_WARNING "%s: out of memory\n", __FUNCTION__);
- irq_exit(cpu, 0x4000);
+ irq_exit();
return;
}

@@ -2201,12 +2193,9 @@
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(cpu, 0x4000);
+ irq_exit();
return;
}

@@ -2215,7 +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)
@@ -2385,20 +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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