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

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Message-ID: <1385829955.5352.40.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sat, 30 Nov 2013 08:45:55 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...essinduktion.org>
Cc:	jongman.heo@...sung.com, David Miller <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ipv6: fix possible seqlock deadlock in
 ip6_finish_output2

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)


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