From a5569a565f7315fe7241cf963f2cc74e53871e11 Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: Mon, 21 Jan 2008 17:18:24 -0800
Subject: [PATCH] keyspan: fix oops
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>
Signed-off-by: Linus Torvalds <torvalds@akpm@linux-foundation.org>
---
drivers/usb/serial/keyspan.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c
index feba9679ace8b..7c069a02c1dd4 100644
--- a/drivers/usb/serial/keyspan.c
+++ b/drivers/usb/serial/keyspan.c
@@ -447,7 +447,7 @@ static void usa26_indat_callback(struct urb *urb)
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*/
--
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