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hwmon: (lm75) Fix write operations for negative temperatures

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[ Upstream commit 7d82fcc9d9 ]

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: e65365fed8 ("hwmon: (lm75) Convert to use regmap")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Guenter Roeck
2019-08-08 12:00:18 -07:00
committed by Greg Kroah-Hartman
parent d9711896dd
commit 55027bf481
1 changed files with 1 additions and 1 deletions
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2
drivers/hwmon/lm75.c
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@@ -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,