net/rxrpc/input.c

1027 			       rxrpc_seq_t hard_ack, rxrpc_seq_t prev_pkt)
1037 	if (after_eq(prev_pkt, call->acks_prev_seq))
1041 	if (after(prev_pkt, base + call->tx_winsize))
1061 	rxrpc_seq_t first_soft_ack, hard_ack, prev_pkt;
1070 	prev_pkt		= sp->ack.prev_ack;
1087 	    prev_pkt == 0 &&
1100 	    prev_pkt == 0 &&
1109 	if (!rxrpc_is_ack_valid(call, hard_ack, prev_pkt)) {
1110 		trace_rxrpc_rx_discard_ack(call, summary.ack_serial, hard_ack, prev_pkt);
1125 	call->acks_prev_seq = prev_pkt;