From 4cd4dee55a8a1965afaf983fe0e8f33dac616813 Mon Sep 17 00:00:00 2001
From: christos <christos@NetBSD.org>
Date: Sun, 6 Apr 2014 23:29:58 +0000
Subject: [PATCH] PR/48720: John Kelly: com driver does not allow B0 to be set.
 The code to handle B0 was commented out for no reason given at revision 1.99.
 POSIX mandates to hangup on B0:
 http://pubs.opengroup.org/onlinepubs/9699919799/functions/tcsetattr.html

---
 sys/dev/ic/com.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/sys/dev/ic/com.c b/sys/dev/ic/com.c
index e45027c4bcb4..502bb50c50c1 100644
--- a/sys/dev/ic/com.c
+++ b/sys/dev/ic/com.c
@@ -1,4 +1,4 @@
-/* $NetBSD: com.c,v 1.323 2014/03/16 05:20:27 dholland Exp $ */
+/* $NetBSD: com.c,v 1.324 2014/04/06 23:29:58 christos Exp $ */
 
 /*-
  * Copyright (c) 1998, 1999, 2004, 2008 The NetBSD Foundation, Inc.
@@ -66,7 +66,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: com.c,v 1.323 2014/03/16 05:20:27 dholland Exp $");
+__KERNEL_RCSID(0, "$NetBSD: com.c,v 1.324 2014/04/06 23:29:58 christos Exp $");
 
 #include "opt_com.h"
 #include "opt_ddb.h"
@@ -296,11 +296,9 @@ comspeed(long speed, long frequency, int type)
 	    divisor = 13;
 	}
 
-#if 0
 	if (speed == 0)
 		return (0);
-#endif
-	if (speed <= 0)
+	if (speed < 0)
 		return (-1);
 	x = divrnd(frequency / divisor, speed);
 	if (x <= 0)
@@ -1426,9 +1424,9 @@ comparam(struct tty *tp, struct termios *t)
 	}
 	sc->sc_msr_mask = sc->sc_msr_cts | sc->sc_msr_dcd;
 
-#if 0
 	if (ospeed == 0)
 		CLR(sc->sc_mcr, sc->sc_mcr_dtr);
+#if 0
 	else
 		SET(sc->sc_mcr, sc->sc_mcr_dtr);
 #endif