static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
{
	int id;
	struct rb_node **p = &client->handles.rb_node;
	struct rb_node *parent = NULL;
	struct ion_handle *entry;

	id = idr_alloc(&client->idr, handle, 1, 0, GFP_KERNEL);
	if (id < 0)
		return id;

	handle->id = id;

	while (*p) {
		parent = *p;
		entry = rb_entry(parent, struct ion_handle, node);

		if (handle->buffer < entry->buffer)
			p = &(*p)->rb_left;
		else if (handle->buffer > entry->buffer)
			p = &(*p)->rb_right;
		else
			WARN(1, "%s: buffer already found.", __func__);
	}

	rb_link_node(&handle->node, parent, p);
	rb_insert_color(&handle->node, &client->handles);

	return 0;
}
static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
{
	int id;
	struct rb_node **p = &client->handles.rb_node;
	struct rb_node *parent = NULL;
	struct ion_handle *entry;

	id = idr_alloc(&client->idr, handle, 1, 0, GFP_KERNEL);
	if (id < 0)
		return id;

	handle->id = id;

	while (*p) {
		parent = *p;
		entry = rb_entry(parent, struct ion_handle, node);

		if (handle->buffer < entry->buffer)
			p = &(*p)->rb_left;
		else if (handle->buffer > entry->buffer)
			p = &(*p)->rb_right;
		else
			WARN(1, "%s: buffer already found.", __func__);
	}

	rb_link_node(&handle->node, parent, p);
	rb_insert_color(&handle->node, &client->handles);

	return 0;
}