linux-kernel - [ 04/17] hwmon: (adt7470) Fix incorrect return code check

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Message-Id: <20130813063502.091071356@linuxfoundation.org>
Date:	Mon, 12 Aug 2013 23:35:50 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Curt Brune <curt@...ulusnetworks.com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: [ 04/17] hwmon: (adt7470) Fix incorrect return code check

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Curt Brune <curt@...ulusnetworks.com>

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 <curt@...ulusnetworks.com>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hwmon/adt7470.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hwmon/adt7470.c
+++ b/drivers/hwmon/adt7470.c
@@ -215,7 +215,7 @@ static inline int adt7470_write_word_dat
 					  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)

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