--- drivers/usb/serial/kobil_sct.c

+++ drivers/usb/serial/kobil_sct.c

@@ -345,7 +345,8 @@ static void kobil_close(struct usb_seria

/* FIXME: Add rts/dtr methods */

if (port->write_urb) {

- usb_kill_urb(port->write_urb);

+ usb_poison_urb(port->write_urb);

+ kfree(port->write_urb->transfer_buffer);

usb_free_urb(port->write_urb);

port->write_urb = NULL;

}