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| author | Zhuang Yuyao <mlistz@gmail.com> | 2016-04-18 09:21:42 +0900 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2016-04-21 23:20:59 +0200 |
| commit | 9a3dce62cc5640d7ea17733a2bd1b57665c232b0 (patch) | |
| tree | 18262d9099432d76b6598453783c69ea25d77c8a | |
| parent | 00c9329ebe2d19a13afd86ba75218f868f2788ba (diff) | |
| download | linux-9a3dce62cc5640d7ea17733a2bd1b57665c232b0.tar.bz2 | |
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.c | 4 |
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) |