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

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>
Cc: stable@vger.kernel.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/sis5595.c b/drivers/hwmon/sis5595.c
index 3532026e25dafbf1006bff72559f6e0eba00070e..bf1d7893d51c47b089de29a391e01a14aad6a2b3 100644 (file)
--- a/drivers/hwmon/sis5595.c
+++ b/drivers/hwmon/sis5595.c
@@ -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;