diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 3eb076c..0273759 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -1536,9 +1536,13 @@
 {
 	mlog_entry("(0x%p)\n", sb);
 
+	lock_kernel();
+
 	ocfs2_sync_blockdev(sb);
 	ocfs2_dismount_volume(sb, 0);
 
+	unlock_kernel();
+
 	mlog_exit_void();
 }