- hcd = bus_to_hcd(urb->dev->bus);
- retval = unlink1(hcd, urb, status);
+ /* Prevent the device and bus from going away while
+ * the unlink is carried out. If they are already gone
+ * then urb->use_count must be 0, since disconnected
+ * devices can't have any active URBs.
+ */
+ spin_lock_irqsave(&hcd_urb_unlink_lock, flags);
+ if (atomic_read(&urb->use_count) > 0) {
+ retval = 0;
+ usb_get_dev(urb->dev);
+ }
+ spin_unlock_irqrestore(&hcd_urb_unlink_lock, flags);
+ if (retval == 0) {
+ hcd = bus_to_hcd(urb->dev->bus);
+ retval = unlink1(hcd, urb, status);
+ usb_put_dev(urb->dev);
+ }