From: Alan Cox <alan@lxorguk.ukuu.org.uk>

If we get a data URB back from the hardware after we have put the tty to
bed we go kaboom.  Fortunately all we need to do is process the URB without
trying to ram its contents down the throat of an ex-tty.

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/usb/serial/keyspan.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN drivers/usb/serial/keyspan.c~keyspan-fix-oops drivers/usb/serial/keyspan.c
--- a/drivers/usb/serial/keyspan.c~keyspan-fix-oops
+++ a/drivers/usb/serial/keyspan.c
@@ -447,7 +447,7 @@ static void	usa26_indat_callback(struct 
 
 	port = (struct usb_serial_port *) urb->context;
 	tty = port->tty;
-	if (urb->actual_length) {
+	if (tty && urb->actual_length) {
 		/* 0x80 bit is error flag */
 		if ((data[0] & 0x80) == 0) {
 			/* no errors on individual bytes, only possible overrun err*/
_