diff options
| -rw-r--r-- | drivers/hwmon/max31790.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/hwmon/max31790.c b/drivers/hwmon/max31790.c index 7927468c5271..7e9362f6dc29 100644 --- a/drivers/hwmon/max31790.c +++ b/drivers/hwmon/max31790.c @@ -40,6 +40,8 @@ #define FAN_RPM_MIN 120 #define FAN_RPM_MAX 7864320 +#define FAN_COUNT_REG_MAX 0xffe0 + #define RPM_FROM_REG(reg, sr) (((reg) >> 4) ? \ ((60 * (sr) * 8192) / ((reg) >> 4)) : \ FAN_RPM_MAX) @@ -172,7 +174,10 @@ static int max31790_read_fan(struct device *dev, u32 attr, int channel, switch (attr) { case hwmon_fan_input: sr = get_tach_period(data->fan_dynamics[channel % NR_CHANNEL]); - rpm = RPM_FROM_REG(data->tach[channel], sr); + if (data->tach[channel] == FAN_COUNT_REG_MAX) + rpm = 0; + else + rpm = RPM_FROM_REG(data->tach[channel], sr); *val = rpm; return 0; case hwmon_fan_target: |