Author: joerg
Date: Sun Aug 3 10:47:45 2014
New Revision: 269470
URL: http://svnweb.freebsd.org/changeset/base/269470
Log:
Avoid a divide-by-zero panic when setting the baudrate to 0.
MFC after: 2 weeks
Modified:
head/sys/dev/usb/serial/umcs.c
Modified: head/sys/dev/usb/serial/umcs.c
==============================================================================
--- head/sys/dev/usb/serial/umcs.c Sun Aug 3 10:02:14 2014
(r269469)
+++ head/sys/dev/usb/serial/umcs.c Sun Aug 3 10:47:45 2014
(r269470)
@@ -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);
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