static void binder_cleanup_ref_olocked(struct binder_ref *ref)
{
	bool delete_node = false;

	binder_debug(BINDER_DEBUG_INTERNAL_REFS,
		     "%d delete ref %d desc %d for node %d\n",
		      ref->proc->pid, ref->data.debug_id, ref->data.desc,
		      ref->node->debug_id);

	rb_erase(&ref->rb_node_desc, &ref->proc->refs_by_desc);
	rb_erase(&ref->rb_node_node, &ref->proc->refs_by_node);

	binder_node_inner_lock(ref->node);
	if (ref->data.strong)
		binder_dec_node_nilocked(ref->node, 1, 1);

	hlist_del(&ref->node_entry);
	delete_node = binder_dec_node_nilocked(ref->node, 0, 1);
	binder_node_inner_unlock(ref->node);
	/*
	 * Clear ref->node unless we want the caller to free the node
	 */
	if (!delete_node) {
		/*
		 * The caller uses ref->node to determine
		 * whether the node needs to be freed. Clear
		 * it since the node is still alive.
		 */
		ref->node = NULL;
	}

	if (ref->death) {
		binder_debug(BINDER_DEBUG_DEAD_BINDER,
			     "%d delete ref %d desc %d has death notification\n",
			      ref->proc->pid, ref->data.debug_id,
			      ref->data.desc);
		binder_dequeue_work(ref->proc, &ref->death->work);
		binder_stats_deleted(BINDER_STAT_DEATH);
	}
	binder_stats_deleted(BINDER_STAT_REF);
}
Unknown