From 78305ae70cbad28acba65b69d3497cd301cf3479 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Sun, 20 Nov 2016 14:16:16 -0800 Subject: [PATCH] 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 Signed-off-by: Guenter Roeck --- drivers/hwmon/smsc47m192.c | 5 +++-- 1 file 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); } -- 2.34.1