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| author | Guenter Roeck <linux@roeck-us.net> | 2019-08-08 22:00:18 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-27 16:46:44 +0300 |
| commit | 8cf42a20d95d975fb46841413ecb6670fe791e3d (patch) | |
| tree | 715513444605aea8554d70d416c6dc0d9ac5eb97 /drivers/hwmon/lm75.c | |
| parent | abb78b8d946459494af91302e6da94a9f3f9dab2 (diff) | |
| download | linux-8cf42a20d95d975fb46841413ecb6670fe791e3d.tar.xz | |
hwmon: (lm75) Fix write operations for negative temperatures
[ 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>
Diffstat (limited to 'drivers/hwmon/lm75.c')
| -rw-r--r-- | drivers/hwmon/lm75.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c index 005ffb5ffa92..1737bb5fbaaf 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, |