vfio: Convert container->group_lock to rwsem
authorAlex Williamson <alex.williamson@redhat.com>
Thu, 25 Apr 2013 22:12:38 +0000 (16:12 -0600)
committerAlex Williamson <alex.williamson@redhat.com>
Thu, 25 Apr 2013 22:12:38 +0000 (16:12 -0600)
All current users are writers, maintaining current mutual exclusion.
This lets us add read users next.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

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