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don't divide by zero. ever.

This commit is contained in:
macallan 2010-04-01 05:26:48 +00:00
parent c769b1a3db
commit 2e75e5a699
1 changed files with 4 additions and 3 deletions
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7
sys/dev/i2c/dbcool.c
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@ -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 @@ dbcool_read_rpm(struct dbcool_softc *sc, uint8_t reg)
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 */