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Subject: [media] vb2: fix vb2_poll for output streams Author: Hans Verkuil <hverk...@xs4all.nl> Date: Thu Jul 24 09:19:37 2014 -0300 vb2_poll should always return POLLOUT | POLLWRNORM as long as there are fewer buffers queued than there are buffers available. Poll for an output stream should only wait if all buffers are queued and nobody is dequeuing them. Signed-off-by: Hans Verkuil <hansv...@cisco.com> Acked-by: Marek Szyprowski <m.szyprow...@samsung.com> Signed-off-by: Mauro Carvalho Chehab <m.che...@samsung.com> drivers/media/v4l2-core/videobuf2-core.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-) --- http://git.linuxtv.org/media_tree.git?a=commitdiff;h=1612f20ea025f55741b2d6e8b9c91047a7324a76 diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c index f33508f..c359006 100644 --- a/drivers/media/v4l2-core/videobuf2-core.c +++ b/drivers/media/v4l2-core/videobuf2-core.c @@ -2596,6 +2596,13 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) if ((list_empty(&q->queued_list) && !vb2_is_streaming(q)) || q->error) return res | POLLERR; + /* + * For output streams you can write as long as there are fewer buffers + * queued than there are buffers available. + */ + if (V4L2_TYPE_IS_OUTPUT(q->type) && q->queued_count < q->num_buffers) + return res | POLLOUT | POLLWRNORM; + if (list_empty(&q->done_list)) poll_wait(file, &q->done_wq, wait); _______________________________________________ linuxtv-commits mailing list linuxtv-commits@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits