From: Michael S. Tsirkin <mst@redhat.com>
Date: Wed, 20 Jul 2011 10:41:31 +0000 (+0300)
Subject: vhost-net: update used ring on backend change
X-Git-Tag: v3.1-rc1~316^2~1^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c047e5f3170c2595e66ed67f87cec01afd717212;p=pandora-kernel.git

vhost-net: update used ring on backend change

On backend change, we flushed out outstanding skbs
but forgot to update the used ring, so that
done entries were left in the ubuf_info ring.
As a result we lose heads or complete incorrect ones,
crashing the guest or leaking memory.
Fix by updating the used ring.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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