Re: [PATCH 2/7] atm: replace del_timer by del_timer_sync

From: Eric Dumazet
Date: Wed Mar 26 2014 - 18:22:36 EST


On Wed, 2014-03-26 at 23:02 +0100, Thomas Gleixner wrote:

> That's why you need del_timer_sync() it waits for the timer handler to
> complete and then removes it.

Interesting... So maybe some comment is stale ?


diff --git a/kernel/timer.c b/kernel/timer.c
index accfd241b9e5..c948fa2fc065 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1011,10 +1011,10 @@ EXPORT_SYMBOL(try_to_del_timer_sync);
* the timer it also makes sure the handler has finished executing on other
* CPUs.
*
- * Synchronization rules: Callers must prevent restarting of the timer,
- * otherwise this function is meaningless. It must not be called from
- * interrupt contexts unless the timer is an irqsafe one. The caller must
- * not hold locks which would prevent completion of the timer's
+ * Synchronization rules:
+ * It must not be called from interrupt contexts unless the timer is an
+ * irqsafe one.
+ * The caller must not hold locks which would prevent completion of the timer's
* handler. The timer's handler must not call add_timer_on(). Upon exit the
* timer is not queued and the handler is not running on any CPU.
*


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