ocfs2/dlm: dlm_thread should not sleep while holding the dlm_spinlock

This patch addresses the bug in which the dlm_thread could go to sleep
while holding the dlm_spinlock.

Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

diff --git a/fs/ocfs2/dlm/dlmthread.c b/fs/ocfs2/dlm/dlmthread.c
index cebd089f8955f65a17548b44b658ea2043d87a2f..4060bb328bc8a08c22bbd77c59835d757ebdcda5 100644 (file)
--- a/fs/ocfs2/dlm/dlmthread.c
+++ b/fs/ocfs2/dlm/dlmthread.c
@@ -176,12 +176,14 @@ static int dlm_purge_lockres(struct dlm_ctxt *dlm,
             res->lockname.name, master);
 
        if (!master) {
+               /* drop spinlock...  retake below */
+               spin_unlock(&dlm->spinlock);
+
                spin_lock(&res->spinlock);
                /* This ensures that clear refmap is sent after the set */
                __dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
                spin_unlock(&res->spinlock);
-               /* drop spinlock to do messaging, retake below */
-               spin_unlock(&dlm->spinlock);
+
                /* clear our bit from the master's refmap, ignore errors */
                ret = dlm_drop_lockres_ref(dlm, res);
                if (ret < 0) {