Hi, In some existing code it says: NET_NEEDS_GIANT("i4b_isppp"); s = splimp(); sppp_input(&sc->sc_if, m); splx(s); I have rewritten that code to use its own mutex, but does sppp_input() require Giant to be locked? Can I remove "NET_NEEDS_GIANT(..)" if my "if_start" callback does not require Giant to be locked? --HPS