[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>

3 files changed, 5 insertions, 5 deletions

diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index 7ef6b27d450f..6890f5e11ad0 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -546,7 +546,7 @@ int v4l2_ctrl_log_status(struct file *file, void *fh);
 /* Can be used as a vidioc_subscribe_event function that just subscribes
    control events. */
 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
-                                struct v4l2_event_subscription *sub);
+                                const struct v4l2_event_subscription *sub);
 
 /* Can be used as a poll function that just polls for control events. */
 unsigned int v4l2_ctrl_poll(struct file *file, struct poll_table_struct *wait);
diff --git a/include/media/v4l2-event.h b/include/media/v4l2-event.h
index 2885a810a128..e7c5d170a9cd 100644
--- a/include/media/v4l2-event.h
+++ b/include/media/v4l2-event.h
@@ -124,10 +124,10 @@ void v4l2_event_queue(struct video_device *vdev, const struct v4l2_event *ev);
 void v4l2_event_queue_fh(struct v4l2_fh *fh, const struct v4l2_event *ev);
 int v4l2_event_pending(struct v4l2_fh *fh);
 int v4l2_event_subscribe(struct v4l2_fh *fh,
-                         struct v4l2_event_subscription *sub, unsigned elems,
+                         const struct v4l2_event_subscription *sub, unsigned elems,
                          const struct v4l2_subscribed_event_ops *ops);
 int v4l2_event_unsubscribe(struct v4l2_fh *fh,
-                           struct v4l2_event_subscription *sub);
+                           const struct v4l2_event_subscription *sub);
 void v4l2_event_unsubscribe_all(struct v4l2_fh *fh);
 
 #endif /* V4L2_EVENT_H */
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,