[media] videobuf: only start streaming in poll() if so requested by the poll mask

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
index de4fa4eb8844..ffdf59cfe405 100644
--- a/drivers/media/video/videobuf-core.c
+++ b/drivers/media/video/videobuf-core.c
@@ -1129,6 +1129,7 @@ unsigned int videobuf_poll_stream(struct file *file,
                                   struct videobuf_queue *q,
                                   poll_table *wait)
 {
+        unsigned long req_events = poll_requested_events(wait);
         struct videobuf_buffer *buf = NULL;
         unsigned int rc = 0;
 
@@ -1137,7 +1138,7 @@ unsigned int videobuf_poll_stream(struct file *file,
                 if (!list_empty(&q->stream))
                         buf = list_entry(q->stream.next,
                                          struct videobuf_buffer, stream);
-        } else {
+        } else if (req_events & (POLLIN | POLLRDNORM)) {
                 if (!q->reading)
                         __videobuf_read_start(q);
                 if (!q->reading) {