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[media] videobuf2: don't return POLLERR when only polling for events

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If you only poll for events, then vb2_poll will return POLLPRI | POLLERR if
no streaming is in progress. That's not right, it's perfectly valid to
poll just for events.

Cc: Pawel Osciak <pawel@osciak.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Hans Verkuil 2013-01-30 13:29:02 -03:00 committed by Mauro Carvalho Chehab
parent 971dfc6781
commit cd13823f5d
1 changed files with 5 additions and 0 deletions
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5
drivers/media/v4l2-core/videobuf2-core.c
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@ -1965,6 +1965,11 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
poll_wait(file, &fh->wait, wait);
}
if (!V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLIN | POLLRDNORM)))
return res;
if (V4L2_TYPE_IS_OUTPUT(q->type) && !(req_events & (POLLOUT | POLLWRNORM)))
return res;
/*
* Start file I/O emulator only if streaming API has not been used yet.
*/