[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>

2 files changed, 3 insertions, 3 deletions

diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index ab287f236801..f40003550b60 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -2699,7 +2699,7 @@ int v4l2_ctrl_log_status(struct file *file, void *fh)
 EXPORT_SYMBOL(v4l2_ctrl_log_status);
 
 int v4l2_ctrl_subscribe_event(struct v4l2_fh *fh,
-                                struct v4l2_event_subscription *sub)
+                                const struct v4l2_event_subscription *sub)
 {
         if (sub->type == V4L2_EVENT_CTRL)
                 return v4l2_event_subscribe(fh, sub, 0, &v4l2_ctrl_sub_ev_ops);
diff --git a/drivers/media/v4l2-core/v4l2-event.c b/drivers/media/v4l2-core/v4l2-event.c
index ef2a33c94045..18a040b935a3 100644
--- a/drivers/media/v4l2-core/v4l2-event.c
+++ b/drivers/media/v4l2-core/v4l2-event.c
@@ -203,7 +203,7 @@ int v4l2_event_pending(struct v4l2_fh *fh)
 EXPORT_SYMBOL_GPL(v4l2_event_pending);
 
 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)
 {
         struct v4l2_subscribed_event *sev, *found_ev;
@@ -278,7 +278,7 @@ void v4l2_event_unsubscribe_all(struct v4l2_fh *fh)
 EXPORT_SYMBOL_GPL(v4l2_event_unsubscribe_all);
 
 int v4l2_event_unsubscribe(struct v4l2_fh *fh,
-                           struct v4l2_event_subscription *sub)
+                           const struct v4l2_event_subscription *sub)
 {
         struct v4l2_subscribed_event *sev;
         unsigned long flags;