From: Cristina Opriceana <cristina.opriceana@gmail.com>
Date: Mon, 3 Aug 2015 10:37:40 +0000 (+0300)
Subject: iio: industrialio-buffer: Fix iio_buffer_poll return value
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=1bdc0293901cbea23c6dc29432e81919d4719844;p=openwrt%2Fstaging%2Fblogic.git

iio: industrialio-buffer: Fix iio_buffer_poll return value

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@gmail.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
---

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index faed6efa49ec..d7e908acb480 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -164,7 +164,7 @@ 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 (iio_buffer_ready(indio_dev, rb, rb->watermark, 0))