staging: usbip: bugfixes related to kthread conversion

static int tweak_reset_device_cmd(struct urb *urb)

{

	struct usb_ctrlrequest *req;

	__u16 value;

	__u16 index;

	int ret;

	struct stub_priv *priv = (struct stub_priv *) urb->context;

	struct stub_device *sdev = priv->sdev;

	req = (struct usb_ctrlrequest *) urb->setup_packet;

	value = le16_to_cpu(req->wValue);

	index = le16_to_cpu(req->wIndex);

	usbip_uinfo("reset_device (port %d) to %s\n", index,

						dev_name(&urb->dev->dev));

	usbip_uinfo("reset_device %s\n", dev_name(&urb->dev->dev));

	/* all interfaces should be owned by usbip driver, so just reset it.  */

	ret = usb_lock_device_for_reset(urb->dev, NULL);

	if (ret < 0) {

		dev_err(&urb->dev->dev, "lock for reset\n");

		return ret;

	}

	/* try to reset the device */

	ret = usb_reset_device(urb->dev);

	if (ret < 0)

		dev_err(&urb->dev->dev, "device reset\n");

	usb_unlock_device(urb->dev);

	return ret;

	/*

	 * usb_lock_device_for_reset caused a deadlock: it causes the driver

	 * to unbind. In the shutdown the rx thread is signalled to shut down

	 * but this thread is pending in the usb_lock_device_for_reset.

	 *

	 * Instead queue the reset.

	 *

	 * Unfortunatly an existing usbip connection will be dropped due to

	 * driver unbinding.

	 */

	usb_queue_reset_device(sdev->interface);

	return 0;

}

/*