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hwmon: (dme1737) fix divide-by-0

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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 <[email protected]>
Signed-off-by: Mark M. Hoffman <[email protected]>
This commit is contained in:
Juerg Haefliger 2008-01-27 16:39:46 -08:00 • committed by Mark M. Hoffman
commit ff8421f733
1 changed files with 11 additions and 4 deletions
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15
drivers/hwmon/dme1737.c
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@ -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)