From: Michael S. Tsirkin <mst@redhat.com>
Date: Thu, 15 Jul 2010 12:19:12 +0000 (+0300)
Subject: vhost-net: avoid flush under lock
X-Git-Tag: v2.6.35-rc6~15^2~5^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1680e9063ea28099a1efa8ca11cee069cc7a9bc3;p=pandora-kernel.git

vhost-net: avoid flush under lock

We flush under vq mutex when changing backends.
This creates a deadlock as workqueue being flushed
needs this lock as well.

https://bugzilla.redhat.com/show_bug.cgi?id=612421

Drop the vq mutex before flush: we have the device mutex
which is sufficient to prevent another ioctl from touching
the vq.

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