diff --git a/fs/namespace.c b/fs/namespace.c
index da5c494..5918fc3 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2802,11 +2802,7 @@
 {
 	if (!atomic_dec_and_test(&ns->count))
 		return;
-	namespace_lock();
-	br_write_lock(&vfsmount_lock);
-	umount_tree(ns->root, 0);
-	br_write_unlock(&vfsmount_lock);
-	namespace_unlock();
+	drop_collected_mounts(&ns->root->mnt);
 	free_mnt_ns(ns);
 }