ocfs2/dlm: unlock lockres spinlock before dlm_lockres_put

dlm_lockres_put will call dlm_lockres_release if it is the last
reference, and then it may call dlm_print_one_lock_resource and
take lockres spinlock.

So unlock lockres spinlock before dlm_lockres_put to avoid deadlock.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
(cherry picked from commit b67de018b37a97548645a879c627d4188518e907)

Orabug: 24939243

Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>

diff --git a/fs/ocfs2/dlm/dlmmaster.c b/fs/ocfs2/dlm/dlmmaster.c
index 0918d3b6df723516080c65b2141ff00f51a77855..d0ed471fc6cae8f3a02d4bcc83b298f66998b6a6 100644 (file)
--- a/fs/ocfs2/dlm/dlmmaster.c
+++ b/fs/ocfs2/dlm/dlmmaster.c
@@ -1668,12 +1668,13 @@ send_response:
                if (ret < 0) {
                        mlog(ML_ERROR, "failed to dispatch assert master work\n");
                        response = DLM_MASTER_RESP_ERROR;
+                       spin_unlock(&res->spinlock);
                        dlm_lockres_put(res);
                } else {
                        dispatched = 1;
                        __dlm_lockres_grab_inflight_worker(dlm, res);
+                       spin_unlock(&res->spinlock);
                }
-               spin_unlock(&res->spinlock);
        } else {
                if (res)
                        dlm_lockres_put(res);

diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
index dad6d841f0da88af7f4286d91e7bc3cd7ec91895..b4131965c6b5a9d88c0dff44811bcb0111d138e8 100644 (file)
--- a/fs/ocfs2/dlm/dlmrecovery.c
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -1723,8 +1723,8 @@ int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
                        } else {
                                dispatched = 1;
                                __dlm_lockres_grab_inflight_worker(dlm, res);
+                               spin_unlock(&res->spinlock);
                        }
-                       spin_unlock(&res->spinlock);
                } else {
                        /* put.. incase we are not the master */
                        spin_unlock(&res->spinlock);