usb: ci_udc: fix interaction with CONFIG_USB_ETH_CDC

ci_udc.c's usb_gadget_unregister_driver() doesn't call driver->unbind()
unlike other USB gadget drivers. Fix it to do this.

Without this, when ether.c's CDC Ethernet device is torn down,
eth_unbind() is never called, so dev->gadget is never set to NULL.
For some reason, usb_eth_halt() is called both at the end of the first
use of the Ethernet device, and prior to any subsequent use. Since
dev->gadget is never cleared, all calls to usb_eth_halt() attempt to
stop, disconnect, and clean up the device, resulting in double cleanup,
which hangs U-Boot on my Tegra device at least.

ci_udc allocates its own singleton EP0 request object, and cleans it up
during usb_gadget_unregister_driver(). This appears necessary when using
the USB gadget framework in U-Boot, since that does not allocate/free
the EP0 request. However, the CDC Ethernet driver *does* allocate and
free its own EP0 requests. Consequently, we must protect
ci_ep_free_request() against double-freeing the request.

Signed-off-by: Stephen Warren <swarren@nvidia.com>

drivers/usb/gadget/ci_udc.c

@@ -226,8 +226,11 @@ static void ci_ep_free_request(struct usb_ep *ep, struct usb_request *req)
 	int num;
 
 	num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
-	if (num == 0)
+	if (num == 0) {
+		if (!controller.ep0_req)
+			return;
 		controller.ep0_req = 0;
+	}
 
 	if (ci_req->b_buf)
 		free(ci_req->b_buf);
@@ -909,6 +912,9 @@ int usb_gadget_unregister_driver(struct usb_gadget_driver *driver)
 {
 	udc_disconnect();
 
+	driver->unbind(&controller.gadget);
+	controller.driver = NULL;
+
 	ci_ep_free_request(&controller.ep[0].ep, &controller.ep0_req->req);
 	free(controller.items_mem);
 	free(controller.epts);