--- x/fs/super.c
+++ y/fs/super.c
@@ -1624,9 +1624,9 @@ struct dentry *mount_bdev(struct file_sy
 		 */
 		super_unlock_excl(s);
 		error = setup_bdev_super(s, flags, NULL);
-		__super_lock_excl(s);
 		if (!error)
 			error = fill_super(s, data, flags & SB_SILENT ? 1 : 0);
+		__super_lock_excl(s);
 		if (error) {
 			deactivate_locked_super(s);
 			return ERR_PTR(error);
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -609,6 +609,7 @@ static void reiserfs_put_super(struct su
 		}
 	}
 
+	up_write(&s->s_umount);
 	/*
 	 * note, journal_release checks for readonly mount, and can
 	 * decide not to do a journal_end
@@ -632,6 +633,7 @@ static void reiserfs_put_super(struct su
 	kfree(REISERFS_SB(s)->s_jdev);
 	kfree(s->s_fs_info);
 	s->s_fs_info = NULL;
+	down_write(&s->s_umount);
 }
 
 static struct kmem_cache *reiserfs_inode_cachep;