From 6f3f8e89acb64551ffaba0811771382134108c02 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Wed, 13 Jul 2011 11:01:30 +0200 Subject: [PATCH] videobuf2: only start streaming in poll() if so requested by the poll mask. Signed-off-by: Hans Verkuil Acked-by: Marek Szyprowski Acked-by: Pawel Osciak --- drivers/media/video/videobuf2-core.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c index 979e544388cb..ec9c2d4618a2 100644 --- a/drivers/media/video/videobuf2-core.c +++ b/drivers/media/video/videobuf2-core.c @@ -1619,6 +1619,7 @@ static int __vb2_cleanup_fileio(struct vb2_queue *q); */ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) { + unsigned long req_events = poll_requested_events(wait); unsigned long flags; unsigned int ret; struct vb2_buffer *vb = NULL; @@ -1627,12 +1628,14 @@ unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) * Start file I/O emulator only if streaming API has not been used yet. */ if (q->num_buffers == 0 && q->fileio == NULL) { - if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ)) { + if (!V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_READ) && + (req_events & (POLLIN | POLLRDNORM))) { ret = __vb2_init_fileio(q, 1); if (ret) return POLLERR; } - if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE)) { + if (V4L2_TYPE_IS_OUTPUT(q->type) && (q->io_modes & VB2_WRITE) && + (req_events & (POLLOUT | POLLWRNORM))) { ret = __vb2_init_fileio(q, 0); if (ret) return POLLERR; -- 2.39.5