usb: core: skip interfaces disabled in devicetree

If an interface has an associated devicetree node with status disabled,
do not register the device.  This is useful for boards with a built-in
multifunction USB device where some functions are broken or otherwise
undesired.
Signed-off-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/message.c

@@ -2006,6 +2006,13 @@ int usb_set_configuration(struct usb_device *dev, int configuration)
 	for (i = 0; i < nintf; ++i) {
 		struct usb_interface *intf = cp->interface[i];
 
+		if (intf->dev.of_node &&
+		    !of_device_is_available(intf->dev.of_node)) {
+			dev_info(&dev->dev, "skipping disabled interface %d\n",
+				 intf->cur_altsetting->desc.bInterfaceNumber);
+			continue;
+		}
+
 		dev_dbg(&dev->dev,
 			"adding %s (config #%d, interface %d)\n",
 			dev_name(&intf->dev), configuration,