hwmon: (ntc_thermistor) Avoid math overflow

[cascardo/linux.git] / drivers / hwmon / ntc_thermistor.c

diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c
index 8c23203..8a17f01 100644 (file)
--- a/drivers/hwmon/ntc_thermistor.c
+++ b/drivers/hwmon/ntc_thermistor.c
@@ -145,7 +145,7 @@ struct ntc_data {
 static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
 {
        struct iio_channel *channel = pdata->chan;
-       unsigned int result;
+       s64 result;
        int val, ret;
 
        ret = iio_read_channel_raw(channel, &val);
@@ -155,10 +155,10 @@ static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
        }
 
        /* unit: mV */
-       result = pdata->pullup_uv * val;
+       result = pdata->pullup_uv * (s64) val;
        result >>= 12;
 
-       return result;
+       return (int)result;
 }
 
 static const struct of_device_id ntc_match[] = {