if_detach handling styles

[itojun%iijlab.net@localhost]

>Module Name:   syssrc
>Committed By:  augustss
>Date:          Wed Feb  2 07:23:28 UTC 2000
>
>Modified Files:
>       syssrc/sys/dev/pcmcia: if_ep_pcmcia.c
>
>Log Message:
>Make ep driver detachable.

        I'm not sure if it is documented somewhere, but how should we
        code foo_detach?  ep_pcmcia_detach() has call to bpfdetach()
        with the above change, while ep_pcmcia_attach() doesn't.
        bpfattach() is in elink3.c:epconfig().  i fear to see mismatch
        between dev/ic code and dev/pcmcia code so i'd prefer bpfdetach()
        to be done somewhere in elink3.c.
        could I see an example?

itojun