[Bluetooth]: Add another ignore parameter to the HCI USB driver

This patchs adds the module parameter ignore_dga to the HCI USB driver
which makes it possible to prevent this driver from being loaded by
some buggy Digianswer devices.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/bluetooth/hci_usb.c

@@ -65,6 +65,7 @@
 #endif
 
 static int ignore = 0;
+static int ignore_dga = 0;
 static int ignore_csr = 0;
 static int ignore_sniffer = 0;
 static int reset = 0;
@@ -841,6 +842,9 @@ static int hci_usb_probe(struct usb_interface *intf, const struct usb_device_id
 	if (ignore || id->driver_info & HCI_IGNORE)
 		return -ENODEV;
 
+	if (ignore_dga && id->driver_info & HCI_DIGIANSWER)
+		return -ENODEV;
+
 	if (ignore_csr && id->driver_info & HCI_CSR)
 		return -ENODEV;
 
@@ -1070,6 +1074,9 @@ module_exit(hci_usb_exit);
 module_param(ignore, bool, 0644);
 MODULE_PARM_DESC(ignore, "Ignore devices from the matching table");
 
+module_param(ignore_dga, bool, 0644);
+MODULE_PARM_DESC(ignore_dga, "Ignore devices with id 08fd:0001");
+
 module_param(ignore_csr, bool, 0644);
 MODULE_PARM_DESC(ignore_csr, "Ignore devices with id 0a12:0001");