req->length = USB_BUFSIZE;
req->complete = rx_complete;
+ /* here, we unlock, and only unlock, to avoid deadlock. */
+ spin_unlock(&dev->lock);
error = usb_ep_queue(dev->out_ep, req, GFP_ATOMIC);
+ spin_lock(&dev->lock);
if (error) {
DBG(dev, "rx submit --> %d\n", error);
list_add(&req->list, &dev->rx_reqs);
break;
- } else {
+ }
+ /* if the req is empty, then add it into dev->rx_reqs_active. */
+ else if (list_empty(&req->list)) {
list_add(&req->list, &dev->rx_reqs_active);
}
}
NULL, "g_printer");
if (IS_ERR(dev->pdev)) {
ERROR(dev, "Failed to create device: g_printer\n");
+ status = PTR_ERR(dev->pdev);
goto fail;
}