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

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Message-Id: <20100526.222332.233688655.davem@davemloft.net>
Date:	Wed, 26 May 2010 22:23:32 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	anton@...ba.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: fix lock_sock_bh/unlock_sock_bh

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 27 May 2010 07:20:18 +0200

> [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.
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