fs/ocfs2/dlm: Add missing spin_unlock

Add a spin_unlock missing on the error path.  Unlock as in the other code
that leads to the leave label.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression E1;
@@

* spin_lock(E1,...);
  <+... when != E1
  if (...) {
    ... when != E1
*   return ...;
  }
  ...+>
* spin_unlock(E1,...);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Joel Becker <joel.becker@oracle.com>

diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 6b5a492e1749f8063097a1ebef4e3ef9ad53fdb5..2ccad86fb590c2c7fd6bb59c3649c83380f3a041 100644 (file)
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -1709,6 +1709,7 @@ retry:
                }
 
                if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) {
+                       spin_unlock(&dlm_domain_lock);
                        mlog(ML_ERROR,
                             "Requested locking protocol version is not "
                             "compatible with already registered domain "