[src/trunk]: src/sys/dev/i2c don't divide by zero. ever.

[macallan <macallan%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d87a74c1528f
branches:  trunk
changeset: 753549:d87a74c1528f
user:      macallan <macallan%NetBSD.org@localhost>
date:      Thu Apr 01 05:26:48 2010 +0000

description:
don't divide by zero. ever.

diffstat:

 sys/dev/i2c/dbcool.c |  7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diffs (28 lines):

diff -r b810a304d942 -r d87a74c1528f sys/dev/i2c/dbcool.c
--- a/sys/dev/i2c/dbcool.c      Thu Apr 01 05:10:52 2010 +0000
+++ b/sys/dev/i2c/dbcool.c      Thu Apr 01 05:26:48 2010 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: dbcool.c,v 1.22 2010/04/01 04:29:35 macallan Exp $ */
+/*     $NetBSD: dbcool.c,v 1.23 2010/04/01 05:26:48 macallan Exp $ */
 
 /*-
  * Copyright (c) 2008 The NetBSD Foundation, Inc.
@@ -49,7 +49,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: dbcool.c,v 1.22 2010/04/01 04:29:35 macallan Exp $");
+__KERNEL_RCSID(0, "$NetBSD: dbcool.c,v 1.23 2010/04/01 05:26:48 macallan Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -922,7 +922,8 @@
        if (rpm == 0xffff)
                return 0;       /* 0xffff indicates stalled/failed fan */
 
-       return (sc->sc_dc.dc_chip->rpm_dividend / rpm);
+       /* don't divide by zero */
+       return (rpm == 0)? 0 : (sc->sc_dc.dc_chip->rpm_dividend / rpm);
 }
 
 /* Provide chip's supply voltage, in microvolts */