linux-kernel - Re: [PATCH 2/7] atm: replace del_timer by del_timer

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Message-ID: <1395872545.12610.262.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 26 Mar 2014 15:22:25 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Julia Lawall <Julia.Lawall@...6.fr>,
	"David S. Miller" <davem@...emloft.net>,
	kernel-janitors@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] atm: replace del_timer by del_timer_sync

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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