21 static unsigned int sev_pos(const struct v4l2_subscribed_event *sev, unsigned int idx)  in sev_pos()  argument
23 	idx += sev->first;  in sev_pos()
24 	return idx >= sev->elems ? idx - sev->elems : idx;  in sev_pos()
51 	kev->sev->first = sev_pos(kev->sev, 1);  in __v4l2_event_dequeue()
52 	kev->sev->in_use--;  in __v4l2_event_dequeue()
91 	struct v4l2_subscribed_event *sev;  in v4l2_event_subscribed()  local
95 	list_for_each_entry(sev, &fh->subscribed, list)  in v4l2_event_subscribed()
96 		if (sev->type == type && sev->id == id)  in v4l2_event_subscribed()
97 			return sev;  in v4l2_event_subscribed()
105 	struct v4l2_subscribed_event *sev;  in __v4l2_event_queue_fh()  local
110 	sev = v4l2_event_subscribed(fh, ev->type, ev->id);  in __v4l2_event_queue_fh()
111 	if (sev == NULL)  in __v4l2_event_queue_fh()
118 	if (sev->in_use == sev->elems) {  in __v4l2_event_queue_fh()
120 		kev = sev->events + sev_pos(sev, 0);  in __v4l2_event_queue_fh()
122 		sev->in_use--;  in __v4l2_event_queue_fh()
123 		sev->first = sev_pos(sev, 1);  in __v4l2_event_queue_fh()
125 		if (sev->elems == 1) {  in __v4l2_event_queue_fh()
126 			if (sev->ops && sev->ops->replace) {  in __v4l2_event_queue_fh()
127 				sev->ops->replace(&kev->event, ev);  in __v4l2_event_queue_fh()
130 		} else if (sev->ops && sev->ops->merge) {  in __v4l2_event_queue_fh()
132 				sev->events + sev_pos(sev, 0);  in __v4l2_event_queue_fh()
133 			sev->ops->merge(&kev->event, &second_oldest->event);  in __v4l2_event_queue_fh()
138 	kev = sev->events + sev_pos(sev, sev->in_use);  in __v4l2_event_queue_fh()
145 	sev->in_use++;  in __v4l2_event_queue_fh()
207 static void __v4l2_event_unsubscribe(struct v4l2_subscribed_event *sev)  in __v4l2_event_unsubscribe()  argument
209 	struct v4l2_fh *fh = sev->fh;  in __v4l2_event_unsubscribe()
216 	for (i = 0; i < sev->in_use; i++) {  in __v4l2_event_unsubscribe()
217 		list_del(&sev->events[sev_pos(sev, i)].list);  in __v4l2_event_unsubscribe()
220 	list_del(&sev->list);  in __v4l2_event_unsubscribe()
227 	struct v4l2_subscribed_event *sev, *found_ev;  in v4l2_event_subscribe()  local
238 	sev = kvzalloc(struct_size(sev, events, elems), GFP_KERNEL);  in v4l2_event_subscribe()
239 	if (!sev)  in v4l2_event_subscribe()
242 		sev->events[i].sev = sev;  in v4l2_event_subscribe()
243 	sev->type = sub->type;  in v4l2_event_subscribe()
244 	sev->id = sub->id;  in v4l2_event_subscribe()
245 	sev->flags = sub->flags;  in v4l2_event_subscribe()
246 	sev->fh = fh;  in v4l2_event_subscribe()
247 	sev->ops = ops;  in v4l2_event_subscribe()
248 	sev->elems = elems;  in v4l2_event_subscribe()
255 		list_add(&sev->list, &fh->subscribed);  in v4l2_event_subscribe()
260 		kvfree(sev);  in v4l2_event_subscribe()
261 	} else if (sev->ops && sev->ops->add) {  in v4l2_event_subscribe()
262 		ret = sev->ops->add(sev, elems);  in v4l2_event_subscribe()
265 			__v4l2_event_unsubscribe(sev);  in v4l2_event_subscribe()
267 			kvfree(sev);  in v4l2_event_subscribe()
280 	struct v4l2_subscribed_event *sev;  in v4l2_event_unsubscribe_all()  local
284 		sev = NULL;  in v4l2_event_unsubscribe_all()
288 			sev = list_first_entry(&fh->subscribed,  in v4l2_event_unsubscribe_all()
290 			sub.type = sev->type;  in v4l2_event_unsubscribe_all()
291 			sub.id = sev->id;  in v4l2_event_unsubscribe_all()
294 		if (sev)  in v4l2_event_unsubscribe_all()
296 	} while (sev);  in v4l2_event_unsubscribe_all()
303 	struct v4l2_subscribed_event *sev;  in v4l2_event_unsubscribe()  local
315 	sev = v4l2_event_subscribed(fh, sub->type, sub->id);  in v4l2_event_unsubscribe()
316 	if (sev != NULL)  in v4l2_event_unsubscribe()
317 		__v4l2_event_unsubscribe(sev);  in v4l2_event_unsubscribe()
321 	if (sev && sev->ops && sev->ops->del)  in v4l2_event_unsubscribe()
322 		sev->ops->del(sev);  in v4l2_event_unsubscribe()
326 	kvfree(sev);  in v4l2_event_unsubscribe()