Re: [PATCH] net: fix possible deadlock in sum_frag_mem_limit

[David Miller]

From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Date: Fri, 22 Feb 2013 09:43:35 -0800

> From: Eric Dumazet <edumazet@xxxxxxxxxx>
> 
> Dave Jones reported a lockdep splat occurring in IP defrag code.
> 
> commit 6d7b857d541ecd1d (net: use lib/percpu_counter API for
> fragmentation mem accounting) added a possible deadlock.
> 
> Because percpu_counter_sum_positive() needs to acquire
> a lock that can be used from softirq, we need to disable BH
> in sum_frag_mem_limit()
> 
> Reported-by: Dave Jones <davej@xxxxxxxxxx>
> Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
> Cc: Jesper Dangaard Brouer <brouer@xxxxxxxxxx>

Applied.
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