linux-kernel - [PATCH] percpu_counter: fix CPU unplug race in percpu_counter

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Message-ID: <4936D287.6090206@cosmosbay.com>
Date:	Wed, 03 Dec 2008 19:40:07 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux kernel <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH] percpu_counter: fix CPU unplug race in percpu_counter_destroy()

Hi Andrew

While working on percpu_counter on net-next-2.6, I found
a CPU unplug race in percpu_counter_destroy()

(Very unlikely of course)

Thank you

[PATCH] percpu_counter: fix CPU unplug race in percpu_counter_destroy()

We should first delete the counter from percpu_counters list
before freeing memory, or a percpu_counter_hotcpu_callback()
could dereference a NULL pointer.

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>
---
 lib/percpu_counter.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

View attachment "percpu_counter_destroy.patch" of type "text/plain" (543 bytes)