[PATCH 3.13.y-ckt 20/85] iio: industrialio-buffer: Fix iio_buffer_poll return value

[Kamal Mostafa]

3.13.11-ckt28 -stable review patch.  If anyone has any objections, please let me know.

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

From: Cristina Opriceana <cristina.opriceana at gmail.com>

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