netdev - Re: [PATCH] sky2: Lock transmit queue while disabling device

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Date:	Wed, 06 Jan 2010 20:27:01 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mikem@...g3k.org
Cc:	shemminger@...tta.com, netdev@...r.kernel.org, flyboy@...il.com,
	dhazelton@...er.net, mbreuer@...jas.com,
	"netdev@...r.kernel.org"@ogre.sisk.pl
Subject: Re: [PATCH] sky2: Lock transmit queue while disabling device

From: Mike McCormack <mikem@...g3k.org>
Date: Thu, 31 Dec 2009 19:55:31 +0900

> 
> netif_device_detach() does not take the tx_lock, so it's
>  possible that a call to sky2_xmit_frame is still in
>  progress after netif_device_detach() is complete.
> 
> Take netif_tx_lock() to make sure all transmits have
>  stopped while we're disabling the devices and that
>  no other CPU is still transmitting a frame after
>  we've disabling the device.
> 
> Proposed fix for "sky2 panic under load" reported by Berck E. Nash.
> 
> Signed-off-by: Mike McCormack <mikem@...g3k.org>

Applied to net-next-2.6

Stephen has asked for some further refinements, once that is
all sorted we can think about backporting this to net-2.6
and -stable if necessary.

Thanks.
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