[media] au0828: enforce check for graph creation

If the graph creation fails, don't register the device.
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

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

@@ -172,9 +172,9 @@ static void au0828_usb_v4l2_release(struct v4l2_device *v4l2_dev)
 	struct au0828_dev *dev =
 		container_of(v4l2_dev, struct au0828_dev, v4l2_dev);
 
-	au0828_usb_v4l2_media_release(dev);
 	v4l2_ctrl_handler_free(&dev->v4l2_ctrl_hdl);
 	v4l2_device_unregister(&dev->v4l2_dev);
+	au0828_usb_v4l2_media_release(dev);
 	au0828_usb_release(dev);
 }
 #endif
@@ -253,16 +253,16 @@ static void au0828_media_device_register(struct au0828_dev *dev,
 }
 
 
-static void au0828_create_media_graph(struct au0828_dev *dev)
+static int au0828_create_media_graph(struct au0828_dev *dev)
 {
 #ifdef CONFIG_MEDIA_CONTROLLER
 	struct media_device *mdev = dev->media_dev;
 	struct media_entity *entity;
 	struct media_entity *tuner = NULL, *decoder = NULL;
-	int i;
+	int i, ret;
 
 	if (!mdev)
-		return;
+		return 0;
 
 	media_device_for_each_entity(entity, mdev) {
 		switch (entity->type) {
@@ -279,15 +279,23 @@ static void au0828_create_media_graph(struct au0828_dev *dev)
 
 	/* Something bad happened! */
 	if (!decoder)
-		return;
-
-	if (tuner)
-		media_create_pad_link(tuner, TUNER_PAD_IF_OUTPUT, decoder, 0,
-				      MEDIA_LNK_FL_ENABLED);
-	media_create_pad_link(decoder, 1, &dev->vdev.entity, 0,
-			      MEDIA_LNK_FL_ENABLED);
-	media_create_pad_link(decoder, 2, &dev->vbi_dev.entity, 0,
-			      MEDIA_LNK_FL_ENABLED);
+		return -EINVAL;
+
+	if (tuner) {
+		ret = media_create_pad_link(tuner, TUNER_PAD_IF_OUTPUT,
+					    decoder, 0,
+					    MEDIA_LNK_FL_ENABLED);
+		if (ret)
+			return ret;
+	}
+	ret = media_create_pad_link(decoder, 1, &dev->vdev.entity, 0,
+				    MEDIA_LNK_FL_ENABLED);
+	if (ret)
+		return ret;
+	ret = media_create_pad_link(decoder, 2, &dev->vbi_dev.entity, 0,
+				    MEDIA_LNK_FL_ENABLED);
+	if (ret)
+		return ret;
 
 	for (i = 0; i < AU0828_MAX_INPUT; i++) {
 		struct media_entity *ent = &dev->input_ent[i];
@@ -299,20 +307,27 @@ static void au0828_create_media_graph(struct au0828_dev *dev)
 		case AU0828_VMUX_CABLE:
 		case AU0828_VMUX_TELEVISION:
 		case AU0828_VMUX_DVB:
-			if (tuner)
-				media_create_pad_link(ent, 0, tuner,
-						      TUNER_PAD_RF_INPUT,
-						      MEDIA_LNK_FL_ENABLED);
+			if (!tuner)
+				break;
+
+			ret = media_create_pad_link(ent, 0, tuner,
+						    TUNER_PAD_RF_INPUT,
+						    MEDIA_LNK_FL_ENABLED);
+			if (ret)
+				return ret;
 			break;
 		case AU0828_VMUX_COMPOSITE:
 		case AU0828_VMUX_SVIDEO:
 		default: /* AU0828_VMUX_DEBUG */
 			/* FIXME: fix the decoder PAD */
-			media_create_pad_link(ent, 0, decoder, 0, 0);
+			ret = media_create_pad_link(ent, 0, decoder, 0, 0);
+			if (ret)
+				return ret;
 			break;
 		}
 	}
 #endif
+	return 0;
 }
 
 static int au0828_usb_probe(struct usb_interface *interface,
@@ -427,7 +442,12 @@ static int au0828_usb_probe(struct usb_interface *interface,
 
 	mutex_unlock(&dev->lock);
 
-	au0828_create_media_graph(dev);
+	retval = au0828_create_media_graph(dev);
+	if (retval) {
+		pr_err("%s() au0282_dev_register failed to create graph\n",
+		       __func__);
+		au0828_usb_disconnect(interface);
+	}
 
 	return retval;
 }