From owner-freebsd-hackers  Thu Jan 18  9:58:40 2001
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Message-ID: <3A67101A.BCFB4736@elischer.org>
Date: Thu, 18 Jan 2001 07:47:38 -0800
From: Julian Elischer <julian@elischer.org>
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To: "David E. Cross" <crossd@dogmatix.robotics.cs.rpi.edu>
Cc: Mike Smith <msmith@freebsd.org>,
	"David E. Cross" <crossd@intrepid.cs.rpi.edu>, hackers@freebsd.org,
	crossd@cs.rpi.edu
Subject: Re: Device Driver Question (bus_set_resource)
References: <200101181456.JAA40926@cs.rpi.edu>
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"David E. Cross" wrote:
> 
> > > Thank you...
> > >
> > > After a couple of hours, Jon Chen and I have figured out most of what you
> > > just said :P :)
> > >
> > > How would one use hints with a kld?
> >
> > Badly. 8(  You can only really set them with the loader right now.
> >
> > There are a couple of kernel datastores that need some tweaking; the
> > environment is one of them.
> 
> Ok, everything is working well, except for one last thing...
> 
> I load the driver the first time, and it loads correctly.  I unload it and
> reload it and it attempts to attach twice (with the exact same resource
> values).  I unload and reload it and it attempts to load 3 times, unload/reload
> ... 4 times (you see the pattern).  If I load the second module I am working
> on (exact same type as this module), it tries to re-attach the old module
> "N" times (depending on the number of previous unload/reloads).
> 
> I am obviously building up state somewhere in the kernel... how can I get
> rid of this "state"?

the sample driver in /usr/share/examples/drivers
does the following:

       if (device_find_child(parent, "${1}", 0)) {
                printf("${UPPER}: already attached\n");
                return;
        }

so it doesn't do this if it finds that it has already been done once.
(in the 'identify' routine)
(did you look at the example? It's most of what you need)


> 
> --
> David Cross                               | email: crossd@cs.rpi.edu
> Lab Director                              | Rm: 308 Lally Hall
> Rensselaer Polytechnic Institute,         | Ph: 518.276.2860
> Department of Computer Science            | Fax: 518.276.4033
> I speak only for myself.                  | WinNT:Linux::Linux:FreeBSD
> 
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-- 
      __--_|\  Julian Elischer
     /       \ julian@elischer.org
    (   OZ    ) World tour 2000
---> X_.---._/  from Perth, presently in:  Budapest
            v




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