From ff8421f733c91a70d8edadf9ce2842fca66172fa Mon Sep 17 00:00:00 2001
From: Juerg Haefliger <juergh@gmail.com>
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 <juergh at gmail.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
---
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 85064fb0b7c..307f48de051 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)
--
2.41.3