linux-kernel - Re: [PATCH RFC] virtio_net: fix refill related races

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Message-ID: <20111220194518.GB26692@redhat.com>
Date:	Tue, 20 Dec 2011 21:45:19 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Amit Shah <amit.shah@...hat.com>,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] virtio_net: fix refill related races

On Tue, Dec 20, 2011 at 11:31:54AM -0800, Tejun Heo wrote:
> On Tue, Dec 20, 2011 at 09:30:55PM +0200, Michael S. Tsirkin wrote:
> > Hmm, in that case it looks like a nasty race could get
> > triggered, with try_fill_recv run on multiple CPUs in parallel,
> > corrupting the linked list within the vq.
> > 
> > Using the mutex as my patch did will fix that naturally, as well.
> 
> Don't know the code but just use nrt wq.  There's even a system one
> called system_nrq_wq.
> 
> Thanks.

We can, but we need the mutex for other reasons, anyway.

> -- 
> tejun
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