[media] v4l2: make vidioc_(un)subscribe_event const

Write-only ioctls should have a const argument in the ioctl op.
Do this conversion for vidioc_(un)subscribe_event.
Adding const for write-only ioctls was decided during the 2012 Media Workshop.

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

1 files changed, 2 insertions, 2 deletions

diff --git a/include/media/v4l2-ioctl.h b/include/media/v4l2-ioctl.h
index 865f95d92ba8..3eef4de0ca33 100644
--- a/include/media/v4l2-ioctl.h
+++ b/include/media/v4l2-ioctl.h
@@ -273,9 +273,9 @@ struct v4l2_ioctl_ops {
                                     struct v4l2_dv_timings_cap *cap);
 
         int (*vidioc_subscribe_event)  (struct v4l2_fh *fh,
-                                        struct v4l2_event_subscription *sub);
+                                        const struct v4l2_event_subscription *sub);
         int (*vidioc_unsubscribe_event)(struct v4l2_fh *fh,
-                                        struct v4l2_event_subscription *sub);
+                                        const struct v4l2_event_subscription *sub);
 
         /* For other private ioctls */
         long (*vidioc_default)         (struct file *file, void *fh,