net/mptcp/subflow.c

479 	WRITE_ONCE(msk->ack_seq, subflow->iasn);
1160 	map_seq = mptcp_expand_seq(READ_ONCE(msk->ack_seq), mpext->data_seq, mpext->dsn64);
1302 		u64 ack_seq;
1321 		old_ack = READ_ONCE(msk->ack_seq);
1322 		ack_seq = mptcp_subflow_get_mapped_dsn(subflow);
1323 		pr_debug("msk ack_seq=%llx subflow ack_seq=%llx", old_ack,
1324 			 ack_seq);
1325 		if (unlikely(before64(ack_seq, old_ack))) {
1326 			mptcp_subflow_discard_data(ssk, skb, old_ack - ack_seq);
1378 	subflow->map_seq = READ_ONCE(msk->ack_seq);
1817 	    mptcp_update_rcv_data_fin(msk, READ_ONCE(msk->ack_seq), true))