From owner-freebsd-current@FreeBSD.ORG  Sat Dec 27 13:22:03 2003
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id E53F716A4CE
	for <freebsd-current@freebsd.org>;
	Sat, 27 Dec 2003 13:22:03 -0800 (PST)
Received: from harmony.village.org (rover.bsdimp.com [204.144.255.66])
	by mx1.FreeBSD.org (Postfix) with ESMTP id C535643D49
	for <freebsd-current@freebsd.org>;
	Sat, 27 Dec 2003 13:22:02 -0800 (PST)	(envelope-from imp@bsdimp.com)
Received: from localhost (warner@rover2.village.org [10.0.0.1])
	by harmony.village.org (8.12.10/8.12.9) with ESMTP id hBRLLwAS001649;
	Sat, 27 Dec 2003 14:22:00 -0700 (MST)
	(envelope-from imp@bsdimp.com)
Date: Sat, 27 Dec 2003 14:21:40 -0700 (MST)
Message-Id: <20031227.142140.90125536.imp@bsdimp.com>
To: dhee@myrealbox.com
From: "M. Warner Losh" <imp@bsdimp.com>
In-Reply-To: <1072558219.78a8a760dhee@myrealbox.com>
References: <1072558219.78a8a760dhee@myrealbox.com>
X-Mailer: Mew version 3.3 on Emacs 21.3 / Mule 5.0 (SAKAKI)
Mime-Version: 1.0
Content-Type: Text/Plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
cc: freebsd-current@freebsd.org
Subject: Re: Serial driver problems with 5.2-current
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 27 Dec 2003 21:22:04 -0000

Try this patch.  It bails out more.

Index: sio.c
===================================================================
RCS file: /cache/ncvs/src/sys/dev/sio/sio.c,v
retrieving revision 1.416
diff -u -r1.416 sio.c
--- sio.c	17 Nov 2003 07:21:19 -0000	1.416
+++ sio.c	27 Dec 2003 21:16:50 -0000
@@ -1794,9 +1794,20 @@
 			}
 		}
 		line_status = inb(com->line_status_port);
-
+		if (line_status == 0xff) {
+			printf("sio%d: spouting nonsense -- disabled.\n",
+			    com->unit);
+			com->gone = 1;
+			return;
+		}
 		/* input event? (check first to help avoid overruns) */
 		while (line_status & LSR_RCV_MASK) {
+			if (line_status == 0xff) {
+				printf("sio%d: linstatus bad -- disabled.\n",
+				    com->unit);
+				com->gone = 1;
+				return;
+			}
 			/* break/unnattached error bits or real input? */
 			if (!(line_status & LSR_RXRDY))
 				recv_data = 0;