[media] dvb-usb-v2: create one media_dev per adapter

Instead of assuming just one adapter, change the code to store
one media controller per adapter.

This works fine for dvb-usb, as, on all drivers here, it is not
possible to write a media graph that would mix resources between
the two different adapters.
Acked-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/usb/dvb-usb-v2/dvb_usb.h

@@ -392,10 +392,6 @@ struct dvb_usb_device {
 	struct delayed_work rc_query_work;
 
 	void *priv;
-
-#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
-	struct media_device *media_dev;
-#endif
 };
 
 extern int dvb_usbv2_probe(struct usb_interface *,

drivers/media/usb/dvb-usb-v2/dvb_usb_core.c

@@ -400,11 +400,11 @@ static int dvb_usb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
 	return ret;
 }
 
-static void dvb_usbv2_media_device_register(struct dvb_usb_device *d)
+static void dvb_usbv2_media_device_register(struct dvb_usb_adapter *adap)
 {
 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
-
 	struct media_device *mdev;
+	struct dvb_usb_device *d = adap_to_d(adap);
 	struct usb_device *udev = d->udev;
 	int ret;
 
@@ -429,22 +429,23 @@ static void dvb_usbv2_media_device_register(struct dvb_usb_device *d)
 		return;
 	}
 
-	d->media_dev = mdev;
+	adap->dvb_adap.mdev = mdev;
 
 	dev_info(&d->udev->dev, "media controller created\n");
 
 #endif
 }
 
-static void dvb_usbv2_media_device_unregister(struct dvb_usb_device *d)
+static void dvb_usbv2_media_device_unregister(struct dvb_usb_adapter *adap)
 {
 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
-	if (!d->media_dev)
+
+	if (!adap->dvb_adap.mdev)
 		return;
 
-	media_device_unregister(d->media_dev);
-	kfree(d->media_dev);
-	d->media_dev = NULL;
+	media_device_unregister(adap->dvb_adap.mdev);
+	kfree(adap->dvb_adap.mdev);
+	adap->dvb_adap.mdev = NULL;
 
 #endif
 }
@@ -453,6 +454,7 @@ static int dvb_usbv2_adapter_dvb_init(struct dvb_usb_adapter *adap)
 {
 	int ret;
 	struct dvb_usb_device *d = adap_to_d(adap);
+
 	dev_dbg(&d->udev->dev, "%s: adap=%d\n", __func__, adap->id);
 
 	ret = dvb_register_adapter(&adap->dvb_adap, d->name, d->props->owner,
@@ -466,8 +468,7 @@ static int dvb_usbv2_adapter_dvb_init(struct dvb_usb_adapter *adap)
 	adap->dvb_adap.priv = adap;
 
 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
-	dvb_usbv2_media_device_register(d);
-	adap->dvb_adap.mdev = d->media_dev;
+	dvb_usbv2_media_device_register(adap);
 #endif
 
 	if (d->props->read_mac_address) {
@@ -518,7 +519,7 @@ static int dvb_usbv2_adapter_dvb_init(struct dvb_usb_adapter *adap)
 err_dvb_dmxdev_init:
 	dvb_dmx_release(&adap->demux);
 err_dvb_dmx_init:
-	dvb_usbv2_media_device_unregister(d);
+	dvb_usbv2_media_device_unregister(adap);
 	dvb_unregister_adapter(&adap->dvb_adap);
 err_dvb_register_adapter:
 	adap->dvb_adap.priv = NULL;
@@ -537,7 +538,7 @@ static int dvb_usbv2_adapter_dvb_exit(struct dvb_usb_adapter *adap)
 		adap->demux.dmx.close(&adap->demux.dmx);
 		dvb_dmxdev_release(&adap->dmxdev);
 		dvb_dmx_release(&adap->demux);
-		dvb_usbv2_media_device_unregister(d);
+		dvb_usbv2_media_device_unregister(adap);
 		dvb_unregister_adapter(&adap->dvb_adap);
 	}
 
@@ -701,7 +702,7 @@ static int dvb_usbv2_adapter_frontend_init(struct dvb_usb_adapter *adap)
 		}
 	}
 
-	dvb_create_media_graph(d->media_dev);
+	dvb_create_media_graph(adap->dvb_adap.mdev);
 
 	return 0;