usb serial: more fixes and groundwork for tty changes

- If a termios change fails due to lack of memory we should copy the
   old settings back over as the device has not changed
 - Note various locking problems
 - kl5kusb105 had various remaining tty flag handling problems
 - Make safe_serial use tty_insert_flip_string not open coded loops
 - set termios speed properly in usb_serial

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/serial/visor.c

@@ -469,6 +469,8 @@ static int visor_chars_in_buffer (struct usb_serial_port *port)
 	 * have sent out, but hasn't made it through to the
 	 * device, so just tell the tty layer that everything
 	 * is flushed.
+	 *
+	 * FIXME: Should walk outstanding_urbs
 	 */
 	return 0;
 }