Date: Tue, 5 Jun 2001 19:15:30 +0100 (BST) From: Nick Hibma <n_hibma@qubesoft.com> To: Mike Smith <msmith@FreeBSD.ORG> Cc: Jonathan Chen <jon@FreeBSD.ORG>, hackers@FreeBSD.ORG Subject: Re: Resource reservation idea Message-ID: <Pine.BSF.4.10.10106051912280.20600-100000@bluebottle> In-Reply-To: <200106050158.f551wmL06759@mass.dis.org>
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> > - Some dummy driver which grabs the resource. The dummy driver would
> > need to be unloaded when the actual driver needs the resources.
>
> This sounds attractive, but it's hard to find the dummy driver when
> you want to open the bidding for one or more devices again. You also end
> up with the ugly case where the device has more resources than the driver
> uses; you end up needing a placeholder of some sort for these as well, so
> you might as well just built it into the way the bus thinks about child
> devices and be done with it.
It was suggested some time ago to do this by having a priority value
that indicates a dummy, say -10000. When a driver is loaded, all dummies
are detached and the probe is restarted. The dummies are quiet if not
cold booting to avoi a storm of dummies announcing themselves again and
again.
Nick
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