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USB: keyspan: Fix oops

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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.

Cc: stable <stable@kernel.org>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2008-01-03 16:59:04 +00:00 committed by Greg Kroah-Hartman
parent 24e1c13c93
commit 3004e5379a
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/serial/keyspan.c
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@ -838,7 +838,7 @@ static void usa49_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 error on any byte */