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timer: Warn when del_timer_sync() is called in hardirq context

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Add explict warning when del_timer_sync() is called in hardirq
context.

Signed-off-by: Yong Zhang <yong.zhang0@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Yong Zhang 2010-10-20 15:57:33 -07:00 committed by Thomas Gleixner
parent 1118e2cd33
commit 466bd30309
1 changed files with 5 additions and 1 deletions
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6
kernel/timer.c
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@ -974,7 +974,11 @@ int del_timer_sync(struct timer_list *timer)
lock_map_release(&timer->lockdep_map);
local_bh_enable();
#endif
/*
* don't use it in hardirq context, because it
* could lead to deadlock.
*/
WARN_ON(in_irq());
for (;;) {
int ret = try_to_del_timer_sync(timer);
if (ret >= 0)