From c2d9f22ac7b0b4434df8cd12b6f857647d35c3b1 Mon Sep 17 00:00:00 2001 From: Curt Brune Date: Thu, 8 Aug 2013 12:11:03 -0700 Subject: [PATCH] hwmon: (adt7470) Fix incorrect return code check commit 93d783bcca69bfacc8dc739d8a050498402587b5 upstream. In adt7470_write_word_data(), which writes two bytes using i2c_smbus_write_byte_data(), the return codes are incorrectly AND-ed together when they should be OR-ed together. The return code of i2c_smbus_write_byte_data() is zero for success. The upshot is only the first byte was ever written to the hardware. The 2nd byte was never written out. I noticed that trying to set the fan speed limits was not working correctly on my system. Setting the fan speed limits is the only code that uses adt7470_write_word_data(). After making the change the limit settings work and the alarms work also. Signed-off-by: Curt Brune Signed-off-by: Guenter Roeck Signed-off-by: Ben Hutchings --- drivers/hwmon/adt7470.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c index c6d1ce059aea..a9726c18d162 100644 --- a/drivers/hwmon/adt7470.c +++ b/drivers/hwmon/adt7470.c @@ -215,7 +215,7 @@ static inline int adt7470_write_word_data(struct i2c_client *client, u8 reg, u16 value) { return i2c_smbus_write_byte_data(client, reg, value & 0xFF) - && i2c_smbus_write_byte_data(client, reg + 1, value >> 8); + || i2c_smbus_write_byte_data(client, reg + 1, value >> 8); } static void adt7470_init_client(struct i2c_client *client) -- 2.39.2