From ff8421f733c91a70d8edadf9ce2842fca66172fa Mon Sep 17 00:00:00 2001 From: Juerg Haefliger Date: Sun, 27 Jan 2008 16:39:46 -0800 Subject: [PATCH] hwmon: (dme1737) fix divide-by-0 This patch fixes a possible divide-by-0 and a minor bug in the FAN_FROM_REG macro (in TPC mode). Signed-off-by: Juerg Haefliger Acked-by: Jean Delvare Signed-off-by: Mark M. Hoffman --- drivers/hwmon/dme1737.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/hwmon/dme1737.c b/drivers/hwmon/dme1737.c index 85064fb0b7c2..307f48de051f 100644 --- a/drivers/hwmon/dme1737.c +++ b/drivers/hwmon/dme1737.c @@ -283,14 +283,21 @@ static inline int TEMP_HYST_TO_REG(int val, int ix, int reg) /* Fan input RPM */ static inline int FAN_FROM_REG(int reg, int tpc) { - return (reg == 0 || reg == 0xffff) ? 0 : - (tpc == 0) ? 90000 * 60 / reg : tpc * reg; + if (tpc) { + return tpc * reg; + } else { + return (reg == 0 || reg == 0xffff) ? 0 : 90000 * 60 / reg; + } } static inline int FAN_TO_REG(int val, int tpc) { - return SENSORS_LIMIT((tpc == 0) ? 90000 * 60 / val : val / tpc, - 0, 0xffff); + if (tpc) { + return SENSORS_LIMIT(val / tpc, 0, 0xffff); + } else { + return (val <= 0) ? 0xffff : + SENSORS_LIMIT(90000 * 60 / val, 0, 0xfffe); + } } /* Fan TPC (tach pulse count) -- 2.30.2