ack_wmd = msg->msg_hdr.msg.put.ack_wmd;
- lnet_prep_send(msg, LNET_MSG_ACK,
- lnet_pid_to_pid4(&msg->msg_ev.source), 0, 0);
+ lnet_prep_send(msg, LNET_MSG_ACK, &msg->msg_ev.source, 0, 0);
msg->msg_hdr.msg.ack.dst_wmd = ack_wmd;
msg->msg_hdr.msg.ack.match_bits = msg->msg_ev.match_bits;