svn commit: r269722 - stable/8/sys/dev/usb/serial

[Joerg Wunsch]

Author: joerg
Date: Fri Aug  8 15:04:02 2014
New Revision: 269722
URL: http://svnweb.freebsd.org/changeset/base/269722

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

Modified:
  stable/8/sys/dev/usb/serial/umcs.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/dev/   (props changed)
  stable/8/sys/dev/usb/   (props changed)

Modified: stable/8/sys/dev/usb/serial/umcs.c
==============================================================================
--- stable/8/sys/dev/usb/serial/umcs.c	Fri Aug  8 14:56:04 2014	(r269721)
+++ stable/8/sys/dev/usb/serial/umcs.c	Fri Aug  8 15:04:02 2014	(r269722)
@@ -1059,7 +1059,10 @@ 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);