Patchwork [3.5.y.z,extended,stable] Patch "hwmon: (adt7470) Fix incorrect return code check" has been added to staging queue

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Submitter Luis Henriques
Date Aug. 13, 2013, 1:59 p.m.
Message ID <1376402391-18669-1-git-send-email-luis.henriques@canonical.com>
Download mbox | patch
Permalink /patch/266809/
State New
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Luis Henriques - Aug. 13, 2013, 1:59 p.m.
This is a note to let you know that I have just added a patch titled

    hwmon: (adt7470) Fix incorrect return code check

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

From 97bed7faf350dd32bea1234dd66a25889f346989 Mon Sep 17 00:00:00 2001
From: Curt Brune <curt@cumulusnetworks.com>
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 <curt@cumulusnetworks.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 drivers/hwmon/adt7470.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--
1.8.3.2

Patch

diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c
index 54ec890..034085d 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)