[media] ivtv: only start streaming in poll() if polling for input

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/media/video/ivtv/ivtv-fileops.c b/drivers/media/video/ivtv/ivtv-fileops.c
index c9663e885b9..9ff69b5a87e 100644
--- a/drivers/media/video/ivtv/ivtv-fileops.c
+++ b/drivers/media/video/ivtv/ivtv-fileops.c
@@ -746,8 +746,9 @@ unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
         return res;
 }
 
-unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
+unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table *wait)
 {
+        unsigned long req_events = poll_requested_events(wait);
         struct ivtv_open_id *id = fh2id(filp->private_data);
         struct ivtv *itv = id->itv;
         struct ivtv_stream *s = &itv->streams[id->type];
@@ -755,7 +756,8 @@ unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
         unsigned res = 0;
 
         /* Start a capture if there is none */
-        if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
+        if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags) &&
+                        (req_events & (POLLIN | POLLRDNORM))) {
                 int rc;
 
                 rc = ivtv_start_capture(id);