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@xxxxxxxxxxx>
Reviewed-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/media/video/videobuf-core.c | 10 ++++++++--
1 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
index 37afb4e..e93672a 100644
--- a/drivers/media/video/videobuf-core.c
+++ b/drivers/media/video/videobuf-core.c
@@ -1075,8 +1075,14 @@ 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) {
+ if (q->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
+ rc = POLLIN | POLLRDNORM;
+ else if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT)
+ rc = POLLOUT | POLLWRNORM;
+ else
+ BUG();
+ }
}
mutex_unlock(&q->vb_lock);
return rc;
--
1.7.0.31.g1df487
--
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