[media] dvb core: must check dvb_create_media_graph()

If media controller is enabled and mdev is filled, it should
ensure that the media graph will be properly initialized.

Enforce that.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/common/siano/smsdvb-main.c

@@ -1183,7 +1183,11 @@ static int smsdvb_hotplug(struct smscore_device_t *coredev,
 	if (smsdvb_debugfs_create(client) < 0)
 		pr_info("failed to create debugfs node\n");
 
-	dvb_create_media_graph(&client->adapter);
+	rc = dvb_create_media_graph(&client->adapter);
+	if (rc < 0) {
+		pr_err("dvb_create_media_graph failed %d\n", rc);
+		goto client_error;
+	}
 
 	pr_info("DVB interface registered.\n");
 	return 0;

drivers/media/dvb-core/dvbdev.h

@@ -206,7 +206,7 @@ int dvb_register_device(struct dvb_adapter *adap,
 void dvb_unregister_device(struct dvb_device *dvbdev);
 
 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
-int dvb_create_media_graph(struct dvb_adapter *adap);
+__must_check int dvb_create_media_graph(struct dvb_adapter *adap);
 static inline void dvb_register_media_controller(struct dvb_adapter *adap,
 						 struct media_device *mdev)
 {

drivers/media/usb/au0828/au0828-dvb.c

@@ -486,12 +486,14 @@ static int dvb_register(struct au0828_dev *dev)
 	dvb->start_count = 0;
 	dvb->stop_count = 0;
 
-#ifdef CONFIG_MEDIA_CONTROLLER_DVB
-	dvb_create_media_graph(&dvb->adapter);
-#endif
+	result = dvb_create_media_graph(&dvb->adapter);
+	if (result < 0)
+		goto fail_create_graph;
 
 	return 0;
 
+fail_create_graph:
+	dvb_net_release(&dvb->net);
 fail_fe_conn:
 	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 fail_fe_mem:

drivers/media/usb/cx231xx/cx231xx-dvb.c

@@ -551,10 +551,14 @@ static int register_dvb(struct cx231xx_dvb *dvb,
 
 	/* register network adapter */
 	dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
-	dvb_create_media_graph(&dvb->adapter);
+	result = dvb_create_media_graph(&dvb->adapter);
+	if (result < 0)
+		goto fail_create_graph;
 
 	return 0;
 
+fail_create_graph:
+	dvb_net_release(&dvb->net);
 fail_fe_conn:
 	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 fail_fe_mem:

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

@@ -698,7 +698,9 @@ static int dvb_usbv2_adapter_frontend_init(struct dvb_usb_adapter *adap)
 		}
 	}
 
-	dvb_create_media_graph(&adap->dvb_adap);
+	ret = dvb_create_media_graph(&adap->dvb_adap);
+	if (ret < 0)
+		goto err_dvb_unregister_frontend;
 
 	return 0;
 

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

@@ -318,10 +318,12 @@ int dvb_usb_adapter_frontend_init(struct dvb_usb_adapter *adap)
 
 		adap->num_frontends_initialized++;
 	}
+	if (ret)
+		return ret;
 
-	dvb_create_media_graph(&adap->dvb_adap);
+	ret = dvb_create_media_graph(&adap->dvb_adap);
 
-	return 0;
+	return ret;
 }
 
 int dvb_usb_adapter_frontend_exit(struct dvb_usb_adapter *adap)