1 files changed, 7 insertions, 1 deletions

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 922263393c76..0d573c2a6860 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -1113,9 +1113,12 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
         if (!(flags & MS_RDONLY))
                 mode |= FMODE_WRITE;
 
+        lock_kernel();
         sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type);
-        if (IS_ERR(sd.bdev))
+        if (IS_ERR(sd.bdev)) {
+                unlock_kernel();
                 return PTR_ERR(sd.bdev);
+        }
 
         /*
          * To get mount instance using sget() vfs-routine, NILFS needs
@@ -1198,6 +1201,7 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
         if (need_to_close)
                 close_bdev_exclusive(sd.bdev, mode);
         simple_set_mnt(mnt, s);
+        unlock_kernel();
         return 0;
 
  failed_unlock:
@@ -1206,6 +1210,7 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
  failed:
         close_bdev_exclusive(sd.bdev, mode);
 
+        unlock_kernel();
         return err;
 
  cancel_new:
@@ -1218,6 +1223,7 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags,
          * We must finish all post-cleaning before this call;
          * put_nilfs() needs the block device.
          */
+        unlock_kernel();
         return err;
 }