+static int dvb_dmxdev_add_pid(struct dmxdev *dmxdev,
+ struct dmxdev_filter *filter, u16 pid)
+{
+ struct dmxdev_feed *feed;
+
+ if ((filter->type != DMXDEV_TYPE_PES) ||
+ (filter->state < DMXDEV_STATE_SET))
+ return -EINVAL;
+
+ /* only TS packet filters may have multiple PIDs */
+ if ((filter->params.pes.output != DMX_OUT_TSDEMUX_TAP) &&
+ (!list_empty(&filter->feed.ts)))
+ return -EINVAL;
+
+ feed = kzalloc(sizeof(struct dmxdev_feed), GFP_KERNEL);
+ if (feed == NULL)
+ return -ENOMEM;
+
+ feed->pid = pid;
+ list_add(&feed->next, &filter->feed.ts);
+
+ if (filter->state >= DMXDEV_STATE_GO)
+ return dvb_dmxdev_start_feed(dmxdev, filter, feed);
+
+ return 0;
+}
+
+static int dvb_dmxdev_remove_pid(struct dmxdev *dmxdev,
+ struct dmxdev_filter *filter, u16 pid)
+{
+ struct dmxdev_feed *feed, *tmp;
+
+ if ((filter->type != DMXDEV_TYPE_PES) ||
+ (filter->state < DMXDEV_STATE_SET))
+ return -EINVAL;
+
+ list_for_each_entry_safe(feed, tmp, &filter->feed.ts, next) {
+ if ((feed->pid == pid) && (feed->ts != NULL)) {
+ feed->ts->stop_filtering(feed->ts);
+ filter->dev->demux->release_ts_feed(filter->dev->demux,
+ feed->ts);
+ list_del(&feed->next);
+ kfree(feed);
+ }
+ }
+
+ return 0;
+}
+