int tc_setup_cb_add(struct tcf_block *block, struct tcf_proto *tp,
		    enum tc_setup_type type, void *type_data, bool err_stop,
		    u32 *flags, unsigned int *in_hw_count, bool rtnl_held)
{
	bool take_rtnl = READ_ONCE(block->lockeddevcnt) && !rtnl_held;
	int ok_count;

retry:
	if (take_rtnl)
		rtnl_lock();
	down_read(&block->cb_lock);
	/* Need to obtain rtnl lock if block is bound to devs that require it.
	 * In block bind code cb_lock is obtained while holding rtnl, so we must
	 * obtain the locks in same order here.
	 */
	if (!rtnl_held && !take_rtnl && block->lockeddevcnt) {
		up_read(&block->cb_lock);
		take_rtnl = true;
		goto retry;
	}

	/* Make sure all netdevs sharing this block are offload-capable. */
	if (block->nooffloaddevcnt && err_stop) {
		ok_count = -EOPNOTSUPP;
		goto err_unlock;
	}

	ok_count = __tc_setup_cb_call(block, type, type_data, err_stop);
	if (ok_count < 0)
		goto err_unlock;

	if (tp->ops->hw_add)
		tp->ops->hw_add(tp, type_data);
	if (ok_count > 0)
		tc_cls_offload_cnt_update(block, tp, in_hw_count, flags,
					  ok_count, true);
err_unlock:
	up_read(&block->cb_lock);
	if (take_rtnl)
		rtnl_unlock();
	return min(ok_count, 0);
}