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 faed6efa49ec3d394de7bf29ba9d411bf037d357..d7e908acb48020b3f5390030e5a3687b03ba9878 100644 (file)
--- 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))