V4L/DVB: videobuf: make poll() report proper flags for output video devices

According to the V4L2 specification, poll() should set POLLOUT | POLLWRNORM
flags for output devices after the frame has been displayed.

Signed-off-by: Pawel Osciak <p.osciak@samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 12 insertions, 2 deletions

diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
index f47cf1ca1239..7d3378437ded 100644
--- a/drivers/media/video/videobuf-core.c
+++ b/drivers/media/video/videobuf-core.c
@@ -1120,8 +1120,18 @@ unsigned int videobuf_poll_stream(struct file *file,
         if (0 == rc) {
                 poll_wait(file, &buf->done, wait);
                 if (buf->state == VIDEOBUF_DONE ||
-                    buf->state == VIDEOBUF_ERROR)
-                        rc = POLLIN|POLLRDNORM;
+                    buf->state == VIDEOBUF_ERROR) {
+                        switch (q->type) {
+                        case V4L2_BUF_TYPE_VIDEO_OUTPUT:
+                        case V4L2_BUF_TYPE_VBI_OUTPUT:
+                        case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
+                                rc = POLLOUT | POLLWRNORM;
+                                break;
+                        default:
+                                rc = POLLIN | POLLRDNORM;
+                                break;
+                        }
+                }
         }
         mutex_unlock(&q->vb_lock);
         return rc;