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[PATCH] cfq-iosched: fix bug in timer handling for the idle class

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There's a small window from when the timer is entered and we grab
the queue lock, where cfq_set_active_queue() could be rearming the
timer for us. Seen in the wild on a 12-way ppc box. Fix this by
just using mod_timer(), which will do the right thing for us.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2006-06-01 10:13:43 +02:00
parent 25776e3594
commit ae818a38d4
1 changed files with 3 additions and 4 deletions
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7
block/cfq-iosched.c
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@ -2193,10 +2193,9 @@ static void cfq_idle_class_timer(unsigned long data)
* race with a non-idle queue, reset timer
*/
end = cfqd->last_end_request + CFQ_IDLE_GRACE;
if (!time_after_eq(jiffies, end)) {
cfqd->idle_class_timer.expires = end;
add_timer(&cfqd->idle_class_timer);
} else
if (!time_after_eq(jiffies, end))
mod_timer(&cfqd->idle_class_timer, end);
else
cfq_schedule_dispatch(cfqd);
spin_unlock_irqrestore(cfqd->queue->queue_lock, flags);