--- a/drivers/usb/misc/yurex.c
+++ b/drivers/usb/misc/yurex.c
@@ -143,8 +143,10 @@ static void yurex_interrupt(struct urb *
 		/* The device is terminated, clean up */
 		return;
 	default:
+#if 0
 		dev_err(&dev->interface->dev,
 			"%s - unknown status received: %d\n", __func__, status);
+#endif
 		goto exit;
 	}
 
@@ -314,6 +316,7 @@ static void yurex_disconnect(struct usb_
 	usb_deregister_dev(interface, &yurex_class);
 
 	/* prevent more I/O from starting */
+	usb_poison_urb(dev->urb);
 	mutex_lock(&dev->io_mutex);
 	dev->interface = NULL;
 	mutex_unlock(&dev->io_mutex);