[media] dvb_usb_v2: add .bInterfaceNumber match

There is no USB match flag for used USB interface. It is rather
common there is multiple interfaces offering different services.
For example one for television and one for remote controller.
Signed-off-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

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

@@ -172,6 +172,7 @@ struct dvb_usb_device_properties {
 	const char *driver_name;
 	struct module *owner;
 	short *adapter_nr;
+	u8 bInterfaceNumber;
 
 	int size_of_priv;
 

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

@@ -350,7 +350,8 @@ int dvb_usbv2_probe(struct usb_interface *intf,
 	struct dvb_usb_driver_info *driver_info =
 			(struct dvb_usb_driver_info *) id->driver_info;
 
-	pr_debug("%s:\n", __func__);
+	pr_debug("%s: bInterfaceNumber=%d\n", __func__,
+			intf->cur_altsetting->desc.bInterfaceNumber);
 
 	if (!id->driver_info) {
 		pr_err("%s: driver_info failed\n", KBUILD_MODNAME);
@@ -371,6 +372,13 @@ int dvb_usbv2_probe(struct usb_interface *intf,
 	d->intf = intf;
 	memcpy(&d->props, driver_info->props,
 			sizeof(struct dvb_usb_device_properties));
+
+	if (d->intf->cur_altsetting->desc.bInterfaceNumber !=
+			d->props.bInterfaceNumber) {
+		ret = 0;
+		goto exit_kfree;
+	}
+
 	mutex_init(&d->usb_mutex);
 	mutex_init(&d->i2c_mutex);
 	INIT_WORK(&d->probe_work, dvb_usbv2_init_work);
@@ -384,6 +392,7 @@ int dvb_usbv2_probe(struct usb_interface *intf,
 	return 0;
 err_kfree:
 	usb_set_intfdata(intf, NULL);
+exit_kfree:
 	kfree(d);
 err:
 	pr_debug("%s: failed=%d\n", __func__, ret);