netdev - Re: [PATCH] virtio-net: fix a race on 32bit arches

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Message-Id: <20120610.202341.2146277133562218686.davem@davemloft.net>
Date:	Sun, 10 Jun 2012 20:23:41 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	mst@...hat.com
Cc:	eric.dumazet@...il.com, jasowang@...hat.com,
	netdev@...r.kernel.org, rusty@...tcorp.com.au,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, shemminger@...tta.com
Subject: Re: [PATCH] virtio-net: fix a race on 32bit arches

From: "Michael S. Tsirkin" <mst@...hat.com>
Date: Sun, 10 Jun 2012 13:25:12 +0300

> On Wed, Jun 06, 2012 at 10:35:24AM +0200, Eric Dumazet wrote:
>> From: Eric Dumazet <edumazet@...gle.com>
>> 
>> commit 3fa2a1df909 (virtio-net: per cpu 64 bit stats (v2)) added a race
>> on 32bit arches.
>> 
>> We must use separate syncp for rx and tx path as they can be run at the
>> same time on different cpus. Thus one sequence increment can be lost and
>> readers spin forever.
>> 
>> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
>> Cc: Stephen Hemminger <shemminger@...tta.com>
>> Cc: Michael S. Tsirkin <mst@...hat.com>
>> Cc: Jason Wang <jasowang@...hat.com>
> 
> I'm still thinking about moving tx to take a xmit lock long term,
> meanwhile this fix appears appropriate for 3.5.
> 
> Acked-by: Michael S. Tsirkin <mst@...hat.com>
> 
> Dave, can you pick this up pls?

Done, thanks.
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