V4L/DVB: uvcvideo: Use POLLOUT and POLLWRNORM for output devices

The V4L2 specification requires drivers to use the write events in the
file operations poll handler for output devices. The uvcvideo driver
erroneously used read events for all devices. Fix this.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/uvc/uvc_queue.c b/drivers/media/video/uvc/uvc_queue.c
index 4a925a31b0e0cb5bcaebe6d654dc2eabebd27482..133c78d113ac2d23cbaa19b993c8d95feb466a9f 100644 (file)
--- a/drivers/media/video/uvc/uvc_queue.c
+++ b/drivers/media/video/uvc/uvc_queue.c
@@ -388,8 +388,12 @@ unsigned int uvc_queue_poll(struct uvc_video_queue *queue, struct file *file,
 
        poll_wait(file, &buf->wait, wait);
        if (buf->state == UVC_BUF_STATE_DONE ||
-           buf->state == UVC_BUF_STATE_ERROR)
-               mask |= POLLIN | POLLRDNORM;
+           buf->state == UVC_BUF_STATE_ERROR) {
+               if (queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+                       mask |= POLLIN | POLLRDNORM;
+               else
+                       mask |= POLLOUT | POLLWRNORM;
+       }
 
 done:
        mutex_unlock(&queue->mutex);