diff --git a/fs/namespace.c b/fs/namespace.c
index 1894d1878dbc266333d099852b4c51e6ffa71317..e8f7f8c58c3c64cacb39629db55262c922797a16 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1516,7 +1516,7 @@ void __detach_mounts(struct dentry *dentry)
 
 	namespace_lock();
 	mp = lookup_mountpoint(dentry);
-	if (!mp)
+	if (IS_ERR_OR_NULL(mp))
 		goto out_unlock;
 
 	lock_mount_hash();