linux-kernel - Re: [RFC PATCH] Subject: virtio: Add unused buffers detach from vring

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Date:	Tue, 15 Dec 2009 23:14:50 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Shirley Ma <mashirle@...ibm.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>, Avi Kivity <avi@...hat.com>,
	netdev@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Anthony Liguori <anthony@...emonkey.ws>
Subject: Re: [RFC PATCH] Subject: virtio: Add unused buffers detach from
	vring

On Tue, Dec 15, 2009 at 11:14:07AM -0800, Shirley Ma wrote:
> Hello Michael,
> 
> On Tue, 2009-12-15 at 20:47 +0200, Michael S. Tsirkin wrote:
> > > +                     detach_buf(vq, i);
> > > +                     END_USE(vq);
> > > +                     return vq->data[i];
> > 
> > In fact, this will return NULL always, won't it?
> 
> Nope, I changed the destroy to detach and return the buffers without
> destroying them within the call. I thought it might be useful in some
> other case. 
> 
> Maybe I should put destroy call back?
> 
> Thanks
> Shirley

No I think it's good as is, we do not need a callback.
I was simply saying that detach_buf sets data to NULL,
so return vq->data[i] after detach does not make sense.
You need to save data as comment below says.c

-- 
MST
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