USB: mct_u232: fix broken close

commit 5260e458f5eff269a43e4f1e9c47186c57b88ddb upstream.

Make sure generic close is called at close.

The driver relies on the generic write implementation but did not call
generic close.

Note that the call to kill the read urb is not redundant, as mct_u232
uses an interrupt urb from the second port as the read urb and that
generic close therefore fails to kill it.

Compile-only tested.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index ef4d7ad..d0bf56d 100644 (file)
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -533,12 +533,14 @@ static void mct_u232_close(struct usb_serial_port *port)
 {
        dbg("%s port %d", __func__, port->number);
 
-       if (port->serial->dev) {
-               /* shutdown our urbs */
-               usb_kill_urb(port->write_urb);
-               usb_kill_urb(port->read_urb);
-               usb_kill_urb(port->interrupt_in_urb);
-       }
+       /*
+        * Must kill the read urb as it is actually an interrupt urb, which
+        * generic close thus fails to kill.
+        */
+       usb_kill_urb(port->read_urb);
+       usb_kill_urb(port->interrupt_in_urb);
+
+       usb_serial_generic_close(port);
 } /* mct_u232_close */