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[PATCH] drivers/isdn/hysdn/hysdn_sched.c: sleep after taking spinlock fix

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spin_lock_irq{save,restore} is incorrectly called here (the function can
sleep after acquring the lock).

done the necessary corrections and removed unwanted cli/sti.

Signed-off-by: Amol Lad <amol@verismonetworks.com>
Signed-off-by: Karsten Keil <kkeil@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Amol Lad 2006-11-02 22:07:25 -08:00 committed by Linus Torvalds
parent 43530d2b04
commit 1f604c4bc0
1 changed files with 4 additions and 15 deletions
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19
drivers/isdn/hysdn/hysdn_sched.c
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@ -155,21 +155,17 @@ hysdn_tx_cfgline(hysdn_card *card, unsigned char *line, unsigned short chan)
if (card->debug_flags & LOG_SCHED_ASYN)
hysdn_addlog(card, "async tx-cfg chan=%d len=%d", chan, strlen(line) + 1);
spin_lock_irqsave(&card->hysdn_lock, flags);
while (card->async_busy) {
sti();
if (card->debug_flags & LOG_SCHED_ASYN)
hysdn_addlog(card, "async tx-cfg delayed");
msleep_interruptible(20); /* Timeout 20ms */
if (!--cnt) {
spin_unlock_irqrestore(&card->hysdn_lock, flags);
if (!--cnt)
return (-ERR_ASYNC_TIME); /* timed out */
}
cli();
} /* wait for buffer to become free */
spin_lock_irqsave(&card->hysdn_lock, flags);
strcpy(card->async_data, line);
card->async_len = strlen(line) + 1;
card->async_channel = chan;
@ -177,30 +173,23 @@ hysdn_tx_cfgline(hysdn_card *card, unsigned char *line, unsigned short chan)
/* now queue the task */
schedule_work(&card->irq_queue);
sti();
spin_unlock_irqrestore(&card->hysdn_lock, flags);
if (card->debug_flags & LOG_SCHED_ASYN)
hysdn_addlog(card, "async tx-cfg data queued");
cnt++; /* short delay */
cli();
while (card->async_busy) {
sti();
if (card->debug_flags & LOG_SCHED_ASYN)
hysdn_addlog(card, "async tx-cfg waiting for tx-ready");
msleep_interruptible(20); /* Timeout 20ms */
if (!--cnt) {
spin_unlock_irqrestore(&card->hysdn_lock, flags);
if (!--cnt)
return (-ERR_ASYNC_TIME); /* timed out */
}
cli();
} /* wait for buffer to become free again */
spin_unlock_irqrestore(&card->hysdn_lock, flags);
if (card->debug_flags & LOG_SCHED_ASYN)
hysdn_addlog(card, "async tx-cfg data send");