[media] media: vb2: return for polling if a buffer is available
The vb2_poll() does not need to wait next vb_buffer_done() if there is already
a buffer in done_list of queue, but current vb2_poll() always waits.
So done_list is checked before calling poll_wait().
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/v4l2-core/videobuf2-core.c b/drivers/media/v4l2-core/videobuf2-core.c
index 7d833ee..e3bdc3b 100644
--- a/drivers/media/v4l2-core/videobuf2-core.c
+++ b/drivers/media/v4l2-core/videobuf2-core.c
@@ -2014,7 +2014,8 @@
if (list_empty(&q->queued_list))
return res | POLLERR;
- poll_wait(file, &q->done_wq, wait);
+ if (list_empty(&q->done_list))
+ poll_wait(file, &q->done_wq, wait);
/*
* Take first buffer available for dequeuing.