Patch "i2c: cros-ec-tunnel: Fix usage of cros_ec_cmd_xfer()" has been added to the 4.7-stable tree

Patch "i2c: cros-ec-tunnel: Fix usage of cros_ec_cmd_xfer()" has been added to the 4.7-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    i2c: cros-ec-tunnel: Fix usage of cros_ec_cmd_xfer()

to the 4.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     i2c-cros-ec-tunnel-fix-usage-of-cros_ec_cmd_xfer.patch
and it can be found in the queue-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 4d01d88019261d05ec3bff5f1a6013393faa3b9e Mon Sep 17 00:00:00 2001
From: Brian Norris <briannorris@chromium.org>
Date: Wed, 10 Aug 2016 13:37:18 -0700
Subject: i2c: cros-ec-tunnel: Fix usage of cros_ec_cmd_xfer()

From: Brian Norris <briannorris@chromium.org>

commit 4d01d88019261d05ec3bff5f1a6013393faa3b9e upstream.

cros_ec_cmd_xfer returns success status if the command transport
completes successfully, but the execution result is incorrectly ignored.
In many cases, the execution result is assumed to be successful, leading
to ignored errors and operating on uninitialized data.

We've recently introduced the cros_ec_cmd_xfer_status() helper to avoid these
problems. Let's use it.

[Regarding the 'Fixes' tag; there is significant refactoring since the driver's
introduction, but the underlying logical error exists throughout I believe]

Fixes: 9d230c9e4f4e ("i2c: ChromeOS EC tunnel driver")
Signed-off-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/i2c/busses/i2c-cros-ec-tunnel.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/i2c/busses/i2c-cros-ec-tunnel.c
+++ b/drivers/i2c/busses/i2c-cros-ec-tunnel.c
@@ -215,7 +215,7 @@ static int ec_i2c_xfer(struct i2c_adapte
 	msg->outsize = request_len;
 	msg->insize = response_len;
 
-	result = cros_ec_cmd_xfer(bus->ec, msg);
+	result = cros_ec_cmd_xfer_status(bus->ec, msg);
 	if (result < 0) {
 		dev_err(dev, "Error transferring EC i2c message %d\n", result);
 		goto exit;


Patches currently in stable-queue which might be from briannorris@chromium.org are

queue-4.7/i2c-cros-ec-tunnel-fix-usage-of-cros_ec_cmd_xfer.patch
queue-4.7/iio-fix-sched-warning-do-not-call-blocking-ops-when-task_running.patch
queue-4.7/mfd-cros_ec-add-cros_ec_cmd_xfer_status-helper.patch