netdev - Re: [Patch] net: kill an RCU warning in inet_fill_link

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Date:	Mon, 06 Dec 2010 13:01:27 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	amwang@...hat.com, linux-kernel@...r.kernel.org,
	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, netdev@...r.kernel.org,
	tgraf@...radead.org
Subject: Re: [Patch] net: kill an RCU warning in inet_fill_link_af()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 01 Dec 2010 17:03:06 +0100

> Le mercredi 01 décembre 2010 à 19:14 +0800, Amerigo Wang a écrit :
>> From: WANG Cong <amwang@...hat.com>
>> 
>> The latest net-next-2.6 triggers an RCU warning during boot,
>> lockdep complains that in inet_fill_link_af() we call rcu_dereference_check()
>> without rcu_read_lock() protection.
>> 
>> This patch fixes it by replacing __in_dev_get_rcu() with in_dev_get().
> 
> Here is a better version, thanks a lot for your report and initial
> patch.
> 
> 
> [PATCH net-next-2.6] net: kill an RCU warning in inet_fill_link_af()
> 
> commits 9f0f7272 (ipv4: AF_INET link address family) and cf7afbfeb8c
> (rtnl: make link af-specific updates atomic) used incorrect
> __in_dev_get_rcu() in RTNL protected contexts, triggering PROVE_RCU
> warnings.
> 
> Switch to __in_dev_get_rtnl(), wich is more appropriate, since we hold
> RTNL.
> 
> Based on a report and initial patch from Amerigo Wang.
> 
> Reported-by: Amerigo Wang <amwang@...hat.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Cc: Thomas Graf <tgraf@...radead.org>

Applied.
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