[media] videobuf2: only start streaming in poll() if so requested by the poll mask
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c
index 2e8f1df..0b1c7711 100644
--- a/drivers/media/video/videobuf2-core.c
+++ b/drivers/media/video/videobuf2-core.c
@@ -1647,6 +1647,7 @@
*/
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;
@@ -1655,12 +1656,14 @@
* 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;