From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 18 Aug 2012 01:29:06 +0000 (-0400)
Subject: vfio: get rid of vfio_device_put()/vfio_group_get_device* races
X-Git-Tag: v3.6-rc3~7^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=90b1253e4139776e8257914ae9e2292d0de2fecc;p=pandora-kernel.git

vfio: get rid of vfio_device_put()/vfio_group_get_device* races

we really need to make sure that dropping the last reference happens
under the group->device_lock; otherwise a loop (under device_lock)
might find vfio_device instance that is being freed right now, has
already dropped the last reference and waits on device_lock to exclude
the sucker from the list.

Acked-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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