rtc: ds1307: ds3231 temperature s16 overflow

while retrieving temperature from ds3231, the result may be overflow
since s16 is too small for a multiplication with 250.

ie. if temp_buf[0] == 0x2d, the result (s16 temp) will be negative.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Tested-by: Michael Tatarinov <kukabu@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index b2156ee5bae1..ee3cae2f212e 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -863,7 +863,7 @@ out:
  * A user-initiated temperature conversion is not started by this function,
  * so the temperature is updated once every 64 seconds.
  */
-static int ds3231_hwmon_read_temp(struct device *dev, s16 *mC)
+static int ds3231_hwmon_read_temp(struct device *dev, s32 *mC)
 {
         struct ds1307 *ds1307 = dev_get_drvdata(dev);
         u8 temp_buf[2];
@@ -892,7 +892,7 @@ static ssize_t ds3231_hwmon_show_temp(struct device *dev,
                                 struct device_attribute *attr, char *buf)
 {
         int ret;
-        s16 temp;
+        s32 temp;
 
         ret = ds3231_hwmon_read_temp(dev, &temp);
         if (ret)