[PATCH] fs: Fix bug in gfs2_freeze_func that can cause deadlock

[Li Dong]

Function gfs2_freeze_func causes a deadlock，because sd_freeze_mutex was
not released when return

Signed-off-by: Li Dong <lidong@xxxxxxxx>
---
 fs/gfs2/super.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c
--- a/fs/gfs2/super.c
+++ b/fs/gfs2/super.c
@@ -741,8 +741,10 @@ void gfs2_freeze_func(struct work_struct *work)
 	set_bit(SDF_FROZEN, &sdp->sd_flags);
 
 	error = gfs2_do_thaw(sdp);
-	if (error)
+	if (error) {
+		mutex_unlock(&sdp->sd_freeze_mutex);
 		goto out;
+	}
 
 	clear_bit(SDF_FROZEN, &sdp->sd_flags);
 
-- 
2.31.1.windows.1