33 static unsigned sev_pos(const struct v4l2_subscribed_event *sev, unsigned idx)  in sev_pos()  argument
35 	idx += sev->first;  in sev_pos()
36 	return idx >= sev->elems ? idx - sev->elems : idx;  in sev_pos()
59 	kev->sev->first = sev_pos(kev->sev, 1);  in __v4l2_event_dequeue()
60 	kev->sev->in_use--;  in __v4l2_event_dequeue()
99 	struct v4l2_subscribed_event *sev;  in v4l2_event_subscribed()  local
103 	list_for_each_entry(sev, &fh->subscribed, list)  in v4l2_event_subscribed()
104 		if (sev->type == type && sev->id == id)  in v4l2_event_subscribed()
105 			return sev;  in v4l2_event_subscribed()
113 	struct v4l2_subscribed_event *sev;  in __v4l2_event_queue_fh()  local
118 	sev = v4l2_event_subscribed(fh, ev->type, ev->id);  in __v4l2_event_queue_fh()
119 	if (sev == NULL)  in __v4l2_event_queue_fh()
126 	if (sev->in_use == sev->elems) {  in __v4l2_event_queue_fh()
128 		kev = sev->events + sev_pos(sev, 0);  in __v4l2_event_queue_fh()
130 		sev->in_use--;  in __v4l2_event_queue_fh()
131 		sev->first = sev_pos(sev, 1);  in __v4l2_event_queue_fh()
133 		if (sev->elems == 1) {  in __v4l2_event_queue_fh()
134 			if (sev->ops && sev->ops->replace) {  in __v4l2_event_queue_fh()
135 				sev->ops->replace(&kev->event, ev);  in __v4l2_event_queue_fh()
138 		} else if (sev->ops && sev->ops->merge) {  in __v4l2_event_queue_fh()
140 				sev->events + sev_pos(sev, 0);  in __v4l2_event_queue_fh()
141 			sev->ops->merge(&kev->event, &second_oldest->event);  in __v4l2_event_queue_fh()
146 	kev = sev->events + sev_pos(sev, sev->in_use);  in __v4l2_event_queue_fh()
153 	sev->in_use++;  in __v4l2_event_queue_fh()
200 static void __v4l2_event_unsubscribe(struct v4l2_subscribed_event *sev)  in __v4l2_event_unsubscribe()  argument
202 	struct v4l2_fh *fh = sev->fh;  in __v4l2_event_unsubscribe()
209 	for (i = 0; i < sev->in_use; i++) {  in __v4l2_event_unsubscribe()
210 		list_del(&sev->events[sev_pos(sev, i)].list);  in __v4l2_event_unsubscribe()
213 	list_del(&sev->list);  in __v4l2_event_unsubscribe()
220 	struct v4l2_subscribed_event *sev, *found_ev;  in v4l2_event_subscribe()  local
231 	sev = kzalloc(sizeof(*sev) + sizeof(struct v4l2_kevent) * elems, GFP_KERNEL);  in v4l2_event_subscribe()
232 	if (!sev)  in v4l2_event_subscribe()
235 		sev->events[i].sev = sev;  in v4l2_event_subscribe()
236 	sev->type = sub->type;  in v4l2_event_subscribe()
237 	sev->id = sub->id;  in v4l2_event_subscribe()
238 	sev->flags = sub->flags;  in v4l2_event_subscribe()
239 	sev->fh = fh;  in v4l2_event_subscribe()
240 	sev->ops = ops;  in v4l2_event_subscribe()
241 	sev->elems = elems;  in v4l2_event_subscribe()
248 		list_add(&sev->list, &fh->subscribed);  in v4l2_event_subscribe()
253 		kfree(sev);  in v4l2_event_subscribe()
254 	} else if (sev->ops && sev->ops->add) {  in v4l2_event_subscribe()
255 		ret = sev->ops->add(sev, elems);  in v4l2_event_subscribe()
258 			__v4l2_event_unsubscribe(sev);  in v4l2_event_subscribe()
260 			kfree(sev);  in v4l2_event_subscribe()
273 	struct v4l2_subscribed_event *sev;  in v4l2_event_unsubscribe_all()  local
277 		sev = NULL;  in v4l2_event_unsubscribe_all()
281 			sev = list_first_entry(&fh->subscribed,  in v4l2_event_unsubscribe_all()
283 			sub.type = sev->type;  in v4l2_event_unsubscribe_all()
284 			sub.id = sev->id;  in v4l2_event_unsubscribe_all()
287 		if (sev)  in v4l2_event_unsubscribe_all()
289 	} while (sev);  in v4l2_event_unsubscribe_all()
296 	struct v4l2_subscribed_event *sev;  in v4l2_event_unsubscribe()  local
308 	sev = v4l2_event_subscribed(fh, sub->type, sub->id);  in v4l2_event_unsubscribe()
309 	if (sev != NULL)  in v4l2_event_unsubscribe()
310 		__v4l2_event_unsubscribe(sev);  in v4l2_event_unsubscribe()
314 	if (sev && sev->ops && sev->ops->del)  in v4l2_event_unsubscribe()
315 		sev->ops->del(sev);  in v4l2_event_unsubscribe()
317 	kfree(sev);  in v4l2_event_unsubscribe()