linux-kernel - Re: [PATCH] virtio_net: use correct accessors for scatterlists

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Message-Id: <200901282129.19364.rusty@rustcorp.com.au>
Date:	Wed, 28 Jan 2009 21:29:18 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	David Miller <davem@...emloft.net>
Cc:	iws@...o.caltech.edu, linux-kernel@...r.kernel.org,
	markmc@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH] virtio_net: use correct accessors for scatterlists

On Tuesday 27 January 2009 15:30:55 David Miller wrote:
> From: Rusty Russell <rusty@...tcorp.com.au>
> Date: Tue, 27 Jan 2009 15:21:19 +1030
> 
> > On Saturday 24 January 2009 10:40:53 Ira Snyder wrote:
> > > Without this fix, virtio_net makes incorrect usage of scatterlists. It sets
> > > the end of the scatterlist chain after the first element, despite the fact
> > > that more entries come after it.
> > > 
> > > If you try to run dma_map_sg() on one of the scatterlists given to you by
> > > add_buf(), you will get a null pointer oops.
> > > 
> > > Signed-off-by: Ira W. Snyder <iws@...o.caltech.edu>
> > 
> > Thanks, this should go in 2.6.29.  Dave?
> 
> Applied, should I queue it up for -stable too Rusty?

I don't think so.  It really is defined as an sg array, not an sg chain.  I'm happy to apply a little patch to make Ira's ongoing development easier, but no reason to panic about it.

Thanks,
Rusty.
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