From: Michael S. Tsirkin <mst@redhat.com>
Date: Thu, 4 Nov 2010 12:24:24 +0000 (+0200)
Subject: virtio: return correct capacity to users
X-Git-Tag: v2.6.37-rc4~35^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ae4b866f86f9ab7b99484b56dd303a860ad1cc9;p=pandora-kernel.git

virtio: return correct capacity to users

We can't rely on indirect buffers for capacity
calculations because they need a memory allocation
which might fail.  In particular, virtio_net can get
into this situation under stress, and it drops packets
and performs badly.

So return the number of buffers we can guarantee users.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reported-By: Krishna Kumar2 <krkumar2@in.ibm.com>
---

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