ocfs2/dlm: fix a dead lock

When we have to take both dlm->master_lock and lockres->spinlock,
take them in order

lockres->spinlock and then dlm->master_lock.

The patch fixes a violation of the rule.
We can simply move taking dlm->master_lock to where we have dropped res->spinlock
since when we access res->state and free mle memory we don't need master_lock's
protection.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Cc: stable@kernel.org
Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 94b97fc6a88e..6d098b89d46e 100644
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -3050,8 +3050,6 @@ int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data,
         /* check for pre-existing lock */
         spin_lock(&dlm->spinlock);
         res = __dlm_lookup_lockres(dlm, name, namelen, hash);
-        spin_lock(&dlm->master_lock);
-
         if (res) {
                 spin_lock(&res->spinlock);
                 if (res->state & DLM_LOCK_RES_RECOVERING) {
@@ -3069,14 +3067,15 @@ int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data,
                 spin_unlock(&res->spinlock);
         }
 
+        spin_lock(&dlm->master_lock);
         /* ignore status.  only nonzero status would BUG. */
         ret = dlm_add_migration_mle(dlm, res, mle, &oldmle,
                                     name, namelen,
                                     migrate->new_master,
                                     migrate->master);
 
-unlock:
         spin_unlock(&dlm->master_lock);
+unlock:
         spin_unlock(&dlm->spinlock);
 
         if (oldmle) {