1 files changed, 1 insertions, 0 deletions

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 6dcee88c2e5d..39cb6591d37d 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -245,6 +245,7 @@ struct super_block *freeze_bdev(struct block_device *bdev)
         sb = get_active_super(bdev);
         if (!sb)
                 goto out;
+        down_write(&sb->s_umount);
         if (sb->s_flags & MS_RDONLY) {
                 sb->s_frozen = SB_FREEZE_TRANS;
                 up_write(&sb->s_umount);