[media] v4l2-event/ctrls/fh: allocate events per fh and per type instead of just per-fh

The driver had to decide how many events to allocate when the v4l2_fh struct
was created. It was possible to add more events afterwards, but there was no
way to ensure that you wouldn't miss important events if the event queue
would fill up for that filehandle.

In addition, once there were no more free events, any new events were simply
dropped on the floor.

For the control event in particular this made life very difficult since
control status/value changes could just be missed if the number of allocated
events and the speed at which the application read events was too low to keep
up with the number of generated events. The application would have no idea
what the latest state was for a control since it could have missed the latest
control change.

So this patch makes some major changes in how events are allocated. Instead
of allocating events per-filehandle they are now allocated when subscribing an
event. So for that particular event type N events (determined by the driver)
are allocated. Those events are reserved for that particular event type.
This ensures that you will not miss events for a particular type altogether.

In addition, if there are N events in use and a new event is raised, then
the oldest event is dropped and the new one is added. So the latest event
is always available.

This can be further improved by adding the ability to merge the state of
two events together, ensuring that no data is lost at all. This will be
added in the next patch.

This also makes it possible to allow the user to determine the number of
events that will be allocated. This is not implemented at the moment, but
would be trivial.

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

1 files changed, 0 insertions, 19 deletions

diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index a15e9098f98b..69662912e50c 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -171,7 +171,6 @@ struct v4l2_ctrl_ref {
   *             control is needed multiple times, so this is a simple
   *             optimization.
   * @buckets:   Buckets for the hashing. Allows for quick control lookup.
-  * @nr_of_refs: Total number of control references in the list.
   * @nr_of_buckets: Total number of buckets in the array.
   * @error:     The error code of the first failed control addition.
   */
@@ -181,7 +180,6 @@ struct v4l2_ctrl_handler {
         struct list_head ctrl_refs;
         struct v4l2_ctrl_ref *cached;
         struct v4l2_ctrl_ref **buckets;
-        u16 nr_of_refs;
         u16 nr_of_buckets;
         int error;
 };
@@ -499,23 +497,6 @@ void v4l2_ctrl_add_event(struct v4l2_ctrl *ctrl,
 void v4l2_ctrl_del_event(struct v4l2_ctrl *ctrl,
                 struct v4l2_subscribed_event *sev);
 
-/** v4l2_ctrl_subscribe_fh() - Helper function that subscribes a control event.
-  * @fh:        The file handler that subscribed the control event.
-  * @sub:       The event to subscribe (type must be V4L2_EVENT_CTRL).
-  * @n:         How many events should be allocated? (Passed to v4l2_event_alloc).
-  *             Recommended to set to twice the number of controls plus whatever
-  *             is needed for other events. This function will set n to
-  *             max(n, 2 * fh->ctrl_handler->nr_of_refs).
-  *
-  * A helper function that initializes the fh for events, allocates the
-  * list of events and subscribes the control event.
-  *
-  * Typically called in the handler of VIDIOC_SUBSCRIBE_EVENT in the
-  * V4L2_EVENT_CTRL case.
-  */
-int v4l2_ctrl_subscribe_fh(struct v4l2_fh *fh,
-                        struct v4l2_event_subscription *sub, unsigned n);
-
 /* Helpers for ioctl_ops. If hdl == NULL then they will all return -EINVAL. */
 int v4l2_queryctrl(struct v4l2_ctrl_handler *hdl, struct v4l2_queryctrl *qc);
 int v4l2_querymenu(struct v4l2_ctrl_handler *hdl, struct v4l2_querymenu *qm);