drm/nouveau: shut lockdep up if last vm ref needs to destroy pgd

}

static void

nouveau_vm_unlink(struct nouveau_vm *vm, struct nouveau_gpuobj *pgd)

nouveau_vm_unlink(struct nouveau_vm *vm, struct nouveau_gpuobj *mpgd)

{

	struct nouveau_vm_pgd *vpgd, *tmp;

	struct nouveau_gpuobj *pgd = NULL;

	if (!pgd)

	if (!mpgd)

		return;

	mutex_lock(&vm->mm->mutex);

	list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {

		if (vpgd->obj != pgd)

			continue;

		if (vpgd->obj == mpgd) {

			pgd = vpgd->obj;

			list_del(&vpgd->head);

		nouveau_gpuobj_ref(NULL, &vpgd->obj);

			kfree(vpgd);

			break;

		}

	}

	mutex_unlock(&vm->mm->mutex);

	nouveau_gpuobj_ref(NULL, &pgd);

}

static void