[3.13.y-ckt stable] Patch "iio: industrialio-buffer: Fix iio_buffer_poll return value" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    iio: industrialio-buffer: Fix iio_buffer_poll return value

to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11-ckt28.

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

For more information about the 3.13.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 459cba071e4f58b2a9c7c99c6e612745c2527969 Mon Sep 17 00:00:00 2001
From: Cristina Opriceana <cristina.opriceana at gmail.com>
Date: Mon, 3 Aug 2015 13:37:40 +0300
Subject: iio: industrialio-buffer: Fix iio_buffer_poll return value

commit 1bdc0293901cbea23c6dc29432e81919d4719844 upstream.

Change return value to 0 if no device is bound since
unsigned int cannot support negative error codes.

Fixes: f18e7a068 ("iio: Return -ENODEV for file operations if the
device has been unregistered")

Signed-off-by: Cristina Opriceana <cristina.opriceana at gmail.com>
Signed-off-by: Jonathan Cameron <jic23 at kernel.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/iio/industrialio-buffer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index d660c89..1d05805 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -67,7 +67,7 @@ unsigned int iio_buffer_poll(struct file *filp,
 	struct iio_buffer *rb = indio_dev->buffer;

 	if (!indio_dev->info)
-		return -ENODEV;
+		return 0;

 	poll_wait(filp, &rb->pollq, wait);
 	if (rb->stufftoread)
--
1.9.1