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authorYong Zhang <yong.zhang@windriver.com>2010-10-20 15:57:33 -0700
committerThomas Gleixner <tglx@linutronix.de>2010-10-22 14:46:25 +0200
commit466bd3030973910118ca601da8072be97a1e2209 (patch)
tree70194e60d4054d045f35e29ee4fcd2230c2622dc
parent1118e2cd33d47254854e1ba3ba8e32802ff14fdf (diff)
downloadop-kernel-dev-466bd3030973910118ca601da8072be97a1e2209.zip
op-kernel-dev-466bd3030973910118ca601da8072be97a1e2209.tar.gz
timer: Warn when del_timer_sync() is called in hardirq context
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>
-rw-r--r--kernel/timer.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index 612de03..483e54b 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -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)
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