/* This action sends an I-format PDU as acknowledge to received PDUs which have not been acknowledged, yet, if there is any. By using of this action number of acknowledgements decreases, this technic is called piggy backing. Returns 0 for success, 1 otherwise.  */
int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb)
/* This action sends an I-format PDU as acknowledge to received PDUs which have not been acknowledged, yet, if there is any. By using of this action number of acknowledgements decreases, this technic is called piggy backing. Returns 0 for success, 1 otherwise.  */
int llc_conn_ac_send_i_as_ack(struct sock *sk, struct sk_buff *skb)
{
	struct llc_sock *llc = llc_sk(sk);
	if (llc->ack_must_be_send) {
		llc_conn_ac_send_i_rsp_f_set_ackpf(sk, skb);
		llc->ack_must_be_send = 0 ;
		llc->ack_pf = 0;
	} else
		llc_conn_ac_send_i_cmd_p_set_0(sk, skb);
	return 0;
}