[PATCH AUTOSEL for 4.9 144/219] md.c:didn't unlock the mddev before return EINVAL in array_size_store

[Sasha Levin]

From: Zhilong Liu <zlliu@xxxxxxxx>

[ Upstream commit b670883bb9e55ba63a278d83e034faefc01ce2cf ]

md.c: it needs to release the mddev lock before
the array_size_store() returns.

Fixes: ab5a98b132fd ("md-cluster: change array_sectors and update size are not supported")

Signed-off-by: Zhilong Liu <zlliu@xxxxxxxx>
Reviewed-by: Guoqing Jiang <gqjiang@xxxxxxxx>
Signed-off-by: Shaohua Li <shli@xxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
 drivers/md/md.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 8ebf1b97e1d2..564da422c179 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4826,8 +4826,10 @@ array_size_store(struct mddev *mddev, const char *buf, size_t len)
 		return err;
 
 	/* cluster raid doesn't support change array_sectors */
-	if (mddev_is_clustered(mddev))
+	if (mddev_is_clustered(mddev)) {
+		mddev_unlock(mddev);
 		return -EINVAL;
+	}
 
 	if (strncmp(buf, "default", 7) == 0) {
 		if (mddev->pers)
-- 
2.14.1