On Thu, Jun 25, 2020 at 3:54 AM Vitaliy Makkoveev
<henscheltig...@yahoo.com> wrote:
>         ifp = ifunit(name);
>         if (ifp == NULL)
>                 return (ENXIO);
> +       ifp->if_dying = 1;

Reference counting, plus an explicit tear-down window, and wait
period, like you've proposed sounds like a good idea. You'll probably
want to make if_dying volatile or cast it to that so that the compiler
doesn't reorder it. But I wonder, at this point, why not go full-on

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