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authorGuenter Roeck <linux@roeck-us.net>2016-11-20 14:16:16 -0800
committerGuenter Roeck <linux@roeck-us.net>2016-12-09 21:54:05 -0800
commit78305ae70cbad28acba65b69d3497cd301cf3479 (patch)
tree058cf909d55ddec34555adf61bd6b1dd052c2869 /drivers/hwmon
parente36ce99ee0815d7919a7b589bfb66f3de50b6bc7 (diff)
hwmon: (smsc47m192) Fix overflows seen when writing into limit attributes
Module test reports overflows when writing into temperature and voltage limit attributes temp1_min: Suspected overflow: [127000 vs. 0] temp1_max: Suspected overflow: [127000 vs. 0] temp1_offset: Suspected overflow: [127000 vs. 0] temp2_min: Suspected overflow: [127000 vs. 0] temp2_max: Suspected overflow: [127000 vs. 0] temp2_offset: Suspected overflow: [127000 vs. 0] temp3_min: Suspected overflow: [127000 vs. 0] temp3_max: Suspected overflow: [127000 vs. 0] temp3_offset: Suspected overflow: [127000 vs. 0] in0_min: Suspected overflow: [3320 vs. 0] in0_max: Suspected overflow: [3320 vs. 0] in4_min: Suspected overflow: [15938 vs. 0] in4_max: Suspected overflow: [15938 vs. 0] in6_min: Suspected overflow: [1992 vs. 0] in6_max: Suspected overflow: [1992 vs. 0] in7_min: Suspected overflow: [2391 vs. 0] in7_max: Suspected overflow: [2391 vs. 0] The problem is caused by conversions from unsigned long to long and from long to int. Reviewed-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/smsc47m192.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/hwmon/smsc47m192.c b/drivers/hwmon/smsc47m192.c
index 6ac7cda72d4c..15650f247679 100644
--- a/drivers/hwmon/smsc47m192.c
+++ b/drivers/hwmon/smsc47m192.c
@@ -77,14 +77,15 @@ static inline unsigned int IN_FROM_REG(u8 reg, int n)
static inline u8 IN_TO_REG(unsigned long val, int n)
{
- return clamp_val(SCALE(val, 192, nom_mv[n]), 0, 255);
+ val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
+ return SCALE(val, 192, nom_mv[n]);
}
/*
* TEMP: 0.001 degC units (-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)
{
return SCALE(clamp_val(val, -128000, 127000), 1, 1000);
}