netdev - Re: PPPOE lockdep report in dev_queue

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Message-Id: <20130219.143425.2168723550194243266.davem@davemloft.net>
Date:	Tue, 19 Feb 2013 14:34:25 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	yaneti@...lera.com, netdev@...r.kernel.org
Subject: Re: PPPOE lockdep report in dev_queue_xmit+0x8b8/0x900

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 19 Feb 2013 10:42:03 -0800

> [PATCH v2] ppp: set qdisc_tx_busylock to avoid LOCKDEP splat
> 
> If a qdisc is installed on a ppp device, its possible to get
> a lockdep splat under stress, because nested dev_queue_xmit() can
> lock busylock a second time (on a different device, so its a false
> positive)
> 
> Avoid this problem using a distinct lock_class_key for ppp
> devices.
> 
> Reported-by: Yanko Kaneti <yaneti@...lera.com>
> Tested-by: Yanko Kaneti <yaneti@...lera.com>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied and queued up for -stable, thanks Eric.
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