From: Alex Williamson <alex.williamson@redhat.com>
Date: Mon, 29 Apr 2013 14:41:36 +0000 (-0600)
Subject: vfio: Use down_reads to protect iommu disconnects
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~64^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b43c082338b857c27d2f87c886eb78812ccd236;p=pandora-kernel.git

vfio: Use down_reads to protect iommu disconnects

If a group or device is released or a container is unset from a group
it can race against file ops on the container.  Protect these with
down_reads to allow concurrent users.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reported-by: Michael S. Tsirkin <mst@redhat.com>
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