Re: [Patch] net: kill an RCU warning in inet_fill_link_af()

[David Miller]

From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
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@xxxxxxxxxx>
>> 
>> 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@xxxxxxxxxx>
> Signed-off-by: Eric Dumazet <eric.dumazet@xxxxxxxxx>
> Cc: Thomas Graf <tgraf@xxxxxxxxxxxxx>

Applied.
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