linux-kernel - Re: [PATCH net] virtio-net: fix the race between channels setting and refill

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Message-Id: <20130703.165945.721617006723749470.davem@davemloft.net>
Date:	Wed, 03 Jul 2013 16:59:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jasowang@...hat.com
Cc:	rusty@...tcorp.com.au, mst@...hat.com,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, sasha.levin@...cle.com
Subject: Re: [PATCH net] virtio-net: fix the race between channels setting
 and refill

From: Jason Wang <jasowang@...hat.com>
Date: Wed,  3 Jul 2013 20:15:52 +0800

> Commit 55257d72bd1c51f25106350f4983ec19f62ed1fa (virtio-net: fill only rx queues
> which are being used) tries to refill on demand when changing the number of
> channels by call try_refill_recv() directly, this may race:
> 
> - the refill work who may do the refill in the same time
> - the try_refill_recv() called in bh since napi was not disabled
> 
> Which may led guest complain during setting channels:
> 
> virtio_net virtio0: input.1:id 0 is not a head!
> 
> Solve this issue by scheduling a refill work which can guarantee the
> serialization of refill.
> 
> Cc: Sasha Levin <sasha.levin@...cle.com>
> Cc: Rusty Russell <rusty@...tcorp.com.au>
> Cc: Michael S. Tsirkin <mst@...hat.com>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Michael, please review.

Thanks.
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