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rbd: initialize snap_rwsem in rbd_add()

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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>
This commit is contained in:
Alex Elder 2012-01-11 19:42:15 -08:00 committed by Sage Weil
parent a40dc6cc2e
commit 0e805a1d85
1 changed files with 2 additions and 0 deletions
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2
drivers/block/rbd.c
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@ -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);