Commit 0a98f943 authored by Guenter Roeck's avatar Guenter Roeck Committed by Greg Kroah-Hartman

hwmon: (lm78) Fix overflow problems seen when writing large temperature limits

commit 1074d683 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.

Cc: Axel Lin <axel.lin@ingics.com>
Reviewed-by: default avatarAxel Lin <axel.lin@ingics.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent cbde0b49
......@@ -108,7 +108,7 @@ static inline int FAN_FROM_REG(u8 val, int div)
* TEMP: mC (-128C to +127C)
* REG: 1C/bit, two's complement
*/
static inline s8 TEMP_TO_REG(int val)
static inline s8 TEMP_TO_REG(long val)
{
int nval = clamp_val(val, -128000, 127000) ;
return nval < 0 ? (nval - 500) / 1000 : (nval + 500) / 1000;
......
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