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authorGuenter Roeck <linux@roeck-us.net>2014-07-29 20:48:59 -0700
committerGuenter Roeck <linux@roeck-us.net>2014-07-30 21:42:37 -0700
commit1074d683a51f1aded3562add9ef313e75d557327 (patch)
treebb2de0c2d6bd9e9246e470e16fb3cc2f4003f97f /drivers/hwmon/lm78.c
parent3248c3b771ddd9d31695da17ba350eb6e1b80a53 (diff)
downloadlinux-1074d683a51f1aded3562add9ef313e75d557327.tar.bz2
hwmon: (lm78) Fix overflow problems seen when writing large temperature 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. Cc: Axel Lin <axel.lin@ingics.com> Cc: stable@vger.kernel.org Reviewed-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon/lm78.c')
-rw-r--r--drivers/hwmon/lm78.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwmon/lm78.c b/drivers/hwmon/lm78.c
index 9efadfc851bc..c1eb464f0fd0 100644
--- a/drivers/hwmon/lm78.c
+++ b/drivers/hwmon/lm78.c
@@ -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;