rbd: initialize snap_rwsem in rbd_add()

New rbd device structures get initialized in rbd_add().  Many of
the fields rely on being initially zero-filled.  However we lockdep
was noticing that the rw_semaphore embedded in the header field
was not getting properly initialized.  Fix that.

Signed-off-by: Alex Elder <elder@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 148ab944378d..3fd31dec8c9c 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2184,6 +2184,8 @@ static ssize_t rbd_add(struct bus_type *bus,
         INIT_LIST_HEAD(&rbd_dev->node);
         INIT_LIST_HEAD(&rbd_dev->snaps);
 
+        init_rwsem(&rbd_dev->header.snap_rwsem);
+
         /* generate unique id: find highest unique id, add one */
         mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);