--- zzzz-none-000/linux-2.6.32.61/drivers/usb/serial/generic.c	2013-06-10 09:43:48.000000000 +0000
+++ ar10-7272-687/linux-2.6.32.61/drivers/usb/serial/generic.c	2015-04-09 11:31:23.000000000 +0000
@@ -243,6 +243,7 @@
 	return bwrite;
 
 error:
+    usb_unlink_urb(urb);
 	usb_free_urb(urb);
 error_no_urb:
 	kfree(buffer);