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Date:	Thu, 04 Jul 2013 11:48:31 +0930
From:	Rusty Russell <>
To:	Jason Wang <>,,,,
Cc:	Jason Wang <>,
	Sasha Levin <>
Subject: Re: [PATCH net] virtio-net: fix the race between channels setting and refill

Jason Wang <> writes:
> 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 <>
> Cc: Rusty Russell <>
> Cc: Michael S. Tsirkin <>
> Signed-off-by: Jason Wang <>


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