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hwmon: (sis5595) Prevent overflow problem when writing large limits

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commit cc336546ddca8c22de83720632431c16a5f9fe9a upstream.

On platforms with sizeof(int) < sizeof(long), writing a temperature
limit larger than MAXINT will result in unpredictable limit values
written to the chip. Avoid auto-conversion from long to int to fix
the problem.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Axel Lin 2014-07-31 22:27:04 +08:00 committed by Greg Kroah-Hartman
parent 61d2b2bea7
commit 5fafb69d98
1 changed files with 1 additions and 1 deletions
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2
drivers/hwmon/sis5595.c
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@ -159,7 +159,7 @@ static inline int TEMP_FROM_REG(s8 val)
{
return val * 830 + 52120;
}
static inline s8 TEMP_TO_REG(int val)
static inline s8 TEMP_TO_REG(long val)
{
int nval = clamp_val(val, -54120, 157530) ;
return nval < 0 ? (nval - 5212 - 415) / 830 : (nval - 5212 + 415) / 830;