netdev - Re: [PATCH] net: fix lock_sock_bh/unlock_sock

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Date:	Thu, 27 May 2010 00:29:36 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	anton@...ba.org
Cc:	eric.dumazet@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH] net: fix lock_sock_bh/unlock_sock_bh

From: Anton Blanchard <anton@...ba.org>
Date: Thu, 27 May 2010 16:09:23 +1000

> 
>> > [PATCH v2] net: fix lock_sock_bh/unlock_sock_bh
>> > 
>> > This new sock lock primitive was introduced to speedup some user context
>> > socket manipulation. But it is unsafe to protect two threads, one using
>> > regular lock_sock/release_sock, one using lock_sock_bh/unlock_sock_bh
>> > 
>> > This patch changes lock_sock_bh to be careful against 'owned' state.
>> > If owned is found to be set, we must take the slow path.
>> > lock_sock_bh() now returns a boolean to say if the slow path was taken,
>> > and this boolean is used at unlock_sock_bh time to call the appropriate
>> > unlock function.
>> > 
>> > After this change, BH are either disabled or enabled during the
>> > lock_sock_bh/unlock_sock_bh protected section. This might be misleading,
>> > so we rename these functions to lock_sock_fast()/unlock_sock_fast().
>> > 
>> > Reported-by: Anton Blanchard <anton@...ba.org>
>> > Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
>> 
>> Looks good, I'll wait for positive testing from Anton before applying
>> this.
> 
> Thanks guys, this fixed it.
> 
> Tested-by: Anton Blanchard <anton@...ba.org>

Thanks for testing Anton, I'll apply this now.
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