netdev - Re: [PATCH] ipv6: fix possible seqlock deadlock in ip6_finish

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Message-Id: <20131130.124905.1525994055463627833.davem@davemloft.net>
Date:	Sat, 30 Nov 2013 12:49:05 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	hannes@...essinduktion.org, jongman.heo@...sung.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipv6: fix possible seqlock deadlock in
 ip6_finish_output2

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 30 Nov 2013 08:45:55 -0800

> On Fri, 2013-11-29 at 06:39 +0100, Hannes Frederic Sowa wrote:
>> IPv6 stats are 64 bits and thus are protected with a seqlock. By not
>> disabling bottom-half we could deadlock here if we don't disable bh and
>> a softirq reentrantly updates the same mib.
>> 
>> Cc: Eric Dumazet <eric.dumazet@...il.com>
>> Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
>> ---
> 
> Acked-by: Eric Dumazet <edumazet@...gle.com>
> 
> (Note that the seqlock is only for 32bit arches)

Applied and queued up for -stable, thanks.
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