[media] dvbdev: Don't create indirect links

Indirect links are those whose interface indirectly controls
other functions.

There are two interfaces that have indirect controls at the DVB
side:
- the network interface, which also controls the demux;
- the DVR interface which also controls the demux.

One could argue that the frontend control to the tuner is indirect.
Well, that's debatable. There's no way to create subdev interfaces
for tuner and demod, as those devices are tightly coupled. So, it
was decided that just one interface is the best to control both
entities, and there's no plan (or easy way) to decouple both. So,
the DVB frontend interface should link to both entities.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-core/dvbdev.c

@@ -637,7 +637,7 @@ int dvb_create_media_graph(struct dvb_adapter *adap)
 		}
 	}
 
-	/* Create indirect interface links for FE->tuner, DVR->demux and CA->ca */
+	/* Create interface links for FE->tuner, DVR->demux and CA->ca */
 	media_device_for_each_intf(intf, mdev) {
 		if (intf->type == MEDIA_INTF_T_DVB_CA && ca) {
 			link = media_create_intf_link(ca, intf,
@@ -652,13 +652,19 @@ int dvb_create_media_graph(struct dvb_adapter *adap)
 			if (!link)
 				return -ENOMEM;
 		}
-
+#if 0
+		/*
+		 * Indirect link - let's not create yet, as we don't know how
+		 *		   to handle indirect links, nor if this will
+		 *		   actually be needed.
+		 */
 		if (intf->type == MEDIA_INTF_T_DVB_DVR && demux) {
 			link = media_create_intf_link(demux, intf,
 						      MEDIA_LNK_FL_ENABLED);
 			if (!link)
 				return -ENOMEM;
 		}
+#endif
 		if (intf->type == MEDIA_INTF_T_DVB_DVR) {
 			ret = dvb_create_io_intf_links(adap, intf, DVR_TSOUT);
 			if (ret)