From 245f8c72842d9a8bb39a389d2d68c5f7090d4e70 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Wed, 2 Jan 1991 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1991-01-02

---
 port/devnonet.c | 36 +++++++++++++-----------------------
 power/dat.h     |  2 --
 2 files changed, 13 insertions(+), 25 deletions(-)

diff --git a/port/devnonet.c b/port/devnonet.c
index baad8539df1c68addeca58c1d4cd9cf397b0e48a..d23135cba6d07dd2130d83efebd84e22dfb5ba62 100644
--- a/port/devnonet.c
+++ b/port/devnonet.c
@@ -37,7 +37,6 @@ static void	sendctlmsg(Noconv*, int, int);
 static void	sendmsg(Noconv*, Nomsg*);
 static void	startconv(Noconv*, int, char*, int);
 static void	queueack(Noconv*, int);
-static void	sendack(Noconv*, int);
 
 static void	nonetiput(Queue*, Block*);
 static void	nonetoput(Queue*, Block*);
@@ -921,7 +920,7 @@ sendmsg(Noconv *cp, Nomsg *mp)
 	wq = ifc->wq->next;
 
 	/*
-	 *  one transmitter at a time
+	 *  one transmitter at a time for this connection
 	 */
 	qlock(&cp->xlock);
 
@@ -1005,28 +1004,17 @@ sendmsg(Noconv *cp, Nomsg *mp)
 static void
 sendctlmsg(Noconv *cp, int flag, int new)
 {
-	cp->ctl.len = 0;
-	cp->ctl.first = 0;
-	cp->ctl.acked = 0;
+	Nomsg ctl;
+
+	ctl.len = 0;
+	ctl.first = 0;
+	ctl.acked = 0;
 	if(new)
-		cp->ctl.mid = Nnomsg^cp->out[cp->next].mid;
+		ctl.mid = Nnomsg^cp->out[cp->next].mid;
 	else
-		cp->ctl.mid = cp->lastacked;
+		ctl.mid = cp->lastacked;
 	cp->hdr->flag |= flag;
-	sendmsg(cp, &cp->ctl);
-}
-
-/*
- *  send an acknowledgement
- */
-static void
-sendack(Noconv *cp, int ack)
-{
-	cp->ackmsg.len = 0;
-	cp->ackmsg.first = 0;
-	cp->ackmsg.acked = ack;
-	cp->ackmsg.mid = cp->lastacked;
-	sendmsg(cp, &cp->ctl);
+	sendmsg(cp, &ctl);
 }
 
 /*
@@ -1074,8 +1062,10 @@ nonetrcvmsg(Noconv *cp, Block *bp)
 			if(f & NO_HANGUP)
 				hangup(cp);
 		} else {
-			if(r>0)
-				sendack(cp, h->mid);
+			if(r>0){
+				queueack(cp, h->mid);
+				sendctlmsg(cp, 0, 0);
+			}
 			cp->bad++;
 		}
 		freeb(bp);
diff --git a/power/dat.h b/power/dat.h
index 19aea1b1e0b9a6d7e2be9904d2024734b8a5121b..1d56ebcaf0ad7ea766cea7c39a2d50e481c7651a 100644
--- a/power/dat.h
+++ b/power/dat.h
@@ -561,8 +561,6 @@ struct Noconv {
 
 	QLock	xlock;		/* one trasmitter at a time */
 	Rendez	r;		/* process waiting for an output mid */
-	Nomsg	ctl;		/* for control messages */
-	Nomsg	ackmsg;		/* for acknowledge messages */
 	QLock	mlock;		/* lock for out */
 	Nomsg	out[Nnomsg];	/* messages being sent */
 	int	first;		/* first unacknowledged message */