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hwmon: (smsc47m192) Fix temperature limit and vrm write operations 

commit 043572d544 upstream.

Temperature limit clamps are applied after converting the temperature
from milli-degrees C to degrees C, so either the clamp limit needs
to be specified in degrees C, not milli-degrees C, or clamping must
happen before converting to degrees C. Use the latter method to avoid
overflows.

vrm is an u8, so the written value needs to be limited to [0, 255].

Cc: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Guenter Roeck 2014-07-18 07:31:18 -07:00 committed by Greg Kroah-Hartman
parent 0caab30825
commit 8fb29faae0
1 changed files with 3 additions and 1 deletions
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4
drivers/hwmon/smsc47m192.c
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@ -86,7 +86,7 @@ static inline u8 IN_TO_REG(unsigned long val, int n)
*/
static inline s8 TEMP_TO_REG(int val)
{
return clamp_val(SCALE(val, 1, 1000), -128000, 127000);
return SCALE(clamp_val(val, -128000, 127000), 1, 1000);
}
static inline int TEMP_FROM_REG(s8 val)
@ -384,6 +384,8 @@ static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
err = kstrtoul(buf, 10, &val);
if (err)
return err;
if (val > 255)
return -EINVAL;
data->vrm = val;
return count;