3.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <redacted>

commit 3eb55cc4ed88eee3b5230f66abcdbd2a91639eda upstream.

The driver set the usb-serial port pointers to NULL on errors in attach,
effectively preventing usb-serial core from decrementing the port ref
counters and releasing the port devices and associated data.

Signed-off-by: Johan Hovold <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/serial/mos7840.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c

@@ -2684,7 +2684,6 @@ error:
 		kfree(mos7840_port->ctrl_buf);
 		usb_free_urb(mos7840_port->control_urb);
 		kfree(mos7840_port);
-		serial->port[i] = NULL;
 	}
 	return status;
 }