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From: Joerg Wunsch <joerg@FreeBSD.org>
Date: Fri, 8 Aug 2014 14:56:04 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org
Subject: svn commit: r269721 - stable/9/sys/dev/usb/serial
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Author: joerg
Date: Fri Aug  8 14:56:04 2014
New Revision: 269721
URL: http://svnweb.freebsd.org/changeset/base/269721

Log:
  MFC r269470: Avoid divide-by-zero panic when setting baudrate to 0.

Modified:
  stable/9/sys/dev/usb/serial/umcs.c
Directory Properties:
  stable/9/sys/   (props changed)
  stable/9/sys/dev/   (props changed)

Modified: stable/9/sys/dev/usb/serial/umcs.c
==============================================================================
--- stable/9/sys/dev/usb/serial/umcs.c	Fri Aug  8 14:53:01 2014	(r269720)
+++ stable/9/sys/dev/usb/serial/umcs.c	Fri Aug  8 14:56:04 2014	(r269721)
@@ -1083,7 +1083,10 @@ umcs7840_calc_baudrate(uint32_t rate, ui
 
 	for (i = 0; i < umcs7840_baudrate_divisors_len - 1 &&
 	    !(rate > umcs7840_baudrate_divisors[i] && rate <= umcs7840_baudrate_divisors[i + 1]); ++i);
-	*divisor = umcs7840_baudrate_divisors[i + 1] / rate;
+	if (rate == 0)
+		*divisor = 1;	/* XXX */
+	else
+		*divisor = umcs7840_baudrate_divisors[i + 1] / rate;
 	/* 0x00 .. 0x70 */
 	*clk = i << MCS7840_DEV_SPx_CLOCK_SHIFT;
 	return (0);