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authorZhuang Yuyao <mlistz@gmail.com>2016-04-18 09:21:42 +0900
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2016-04-21 23:20:59 +0200
commit9a3dce62cc5640d7ea17733a2bd1b57665c232b0 (patch)
tree18262d9099432d76b6598453783c69ea25d77c8a
parent00c9329ebe2d19a13afd86ba75218f868f2788ba (diff)
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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>
-rw-r--r--drivers/rtc/rtc-ds1307.c4
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)