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Date: Wed, 06 Dec 2000 06:49:50 -0800
From: Julian Elischer <julian@elischer.org>
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To: Brian Somers <brian@Awfulhak.org>
Cc: smp@FreeBSD.org, archie@FreeBSD.org
Subject: Re: Netgraph and SMP
References: <200012051902.eB5J20Y38879@hak.lan.Awfulhak.org>
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Brian Somers wrote:
> 
> I don't think netgraph is the place to deal with this.
> 
> kldunload should be smart enough to do several things:
> 
>   Look at the dependency graph that it maintains (does it?) and
>   decide if there are any dependent modules.  If they are, refuse
>   the unload request.

I be;ieve this is already done (but am not totally sure)
> 
>   Inside it's own lock (preventing any other dependent modules from
>   appearing), it asks the module if it's ok to unload.
> 
> This is obviously more tricky than it sounds.  We've got to ensure
> that if any character device entry points have been created
> (make_dev() etc), we block the relevant entry points so that we can
> ENODEV if the MOD_UNLOAD works.

but what if the process has already entered the driver?

> 
> Apart from the generic cdevsw entry points and module dependencies, I
> think it's pretty much up to the module to ensure that things work -
> unless someone can think of another way that an external source can
> use the module (sysctls spring to mind).

yep

> 
-- 
      __--_|\  Julian Elischer
     /       \ julian@elischer.org
    (   OZ    ) World tour 2000
---> X_.---._/  presently in:  Budapest
            v




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