void drop_collected_mounts(struct vfsmount *mnt)
 {
-       LIST_HEAD(umount_list);
        down_write(&namespace_sem);
        br_write_lock(&vfsmount_lock);
-       umount_tree(real_mount(mnt), 0, &umount_list);
+       umount_tree(real_mount(mnt), 0, &unmounted);
        br_write_unlock(&vfsmount_lock);
-       up_write(&namespace_sem);
-       release_mounts(&umount_list);
+       namespace_unlock();
 }
 
 int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg,
 {
        struct mount *mnt, *next;
        LIST_HEAD(graveyard);
-       LIST_HEAD(umounts);
 
        if (list_empty(mounts))
                return;
        while (!list_empty(&graveyard)) {
                mnt = list_first_entry(&graveyard, struct mount, mnt_expire);
                touch_mnt_namespace(mnt->mnt_ns);
-               umount_tree(mnt, 1, &umounts);
+               umount_tree(mnt, 1, &unmounted);
        }
        br_write_unlock(&vfsmount_lock);
-       up_write(&namespace_sem);
-
-       release_mounts(&umounts);
+       namespace_unlock();
 }
 
 EXPORT_SYMBOL_GPL(mark_mounts_for_expiry);
 
 void put_mnt_ns(struct mnt_namespace *ns)
 {
-       LIST_HEAD(umount_list);
-
        if (!atomic_dec_and_test(&ns->count))
                return;
        down_write(&namespace_sem);
        br_write_lock(&vfsmount_lock);
-       umount_tree(ns->root, 0, &umount_list);
+       umount_tree(ns->root, 0, &unmounted);
        br_write_unlock(&vfsmount_lock);
-       up_write(&namespace_sem);
-       release_mounts(&umount_list);
+       namespace_unlock();
        free_mnt_ns(ns);
 }