From: Guenter Roeck linux@roeck-us.net
[ Upstream commit 7d82fcc9d9e81241778aaa22fda7be753e237d86 ]
Writes into limit registers fail if the temperature written is negative. The regmap write operation checks the value range, regmap_write accepts an unsigned int as parameter, and the temperature value passed to regmap_write is kept in a variable declared as long. Negative values are converted large unsigned integers, which fails the range check. Fix by type casting the temperature to u16 when calling regmap_write().
Cc: Iker Perez del Palomar Sustatxa iker.perez@codethink.co.uk Fixes: e65365fed87f ("hwmon: (lm75) Convert to use regmap") Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/hwmon/lm75.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index 49f4b33..7f28912 100644 --- a/drivers/hwmon/lm75.c +++ b/drivers/hwmon/lm75.c @@ -165,7 +165,7 @@ static int lm75_write(struct device *dev, enum hwmon_sensor_types type, temp = DIV_ROUND_CLOSEST(temp << (resolution - 8), 1000) << (16 - resolution);
- return regmap_write(data->regmap, reg, temp); + return regmap_write(data->regmap, reg, (u16)temp); }
static umode_t lm75_is_visible(const void *data, enum hwmon_sensor_types type,