[XFS] handle error returns from freeze_bdev

SGI-PV: 945483
SGI-Modid: xfs-linux-melb:xfs-kern:201884a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index 7ceabd0e2d9d..d1236d6f4045 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -550,7 +550,7 @@ xfs_fs_goingdown(
                 struct vfs *vfsp = XFS_MTOVFS(mp);
                 struct super_block *sb = freeze_bdev(vfsp->vfs_super->s_bdev);
 
-                if (sb) {
+                if (sb && !IS_ERR(sb)) {
                         xfs_force_shutdown(mp, XFS_FORCE_UMOUNT);
                         thaw_bdev(sb->s_bdev, sb);
                 }