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To: Poul-Henning Kamp <phk@critter.freebsd.dk>
Subject: Re: cvs commit: src/sys/sys bus.h bus_private.h src/sys/kern subr_bus.c 
Cc: Nick Hibma <n_hibma@calcaphon.com>, cvs-committers@FreeBSD.org,
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In-reply-to: Your message of "Mon, 03 Jul 2000 16:27:59 +0200."
		<6433.962634479@critter.freebsd.dk> 
References: <6433.962634479@critter.freebsd.dk>  
Date: Mon, 03 Jul 2000 10:04:55 -0600
From: Warner Losh <imp@village.org>
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In message <6433.962634479@critter.freebsd.dk> Poul-Henning Kamp writes:
: Example: Hot-plug.  My cPCI card fails, I pull it and plug another one
: in, I will very likely not want to loose my softc in that case.

With pccard right now you'd lose it.  The device is gone.  Sure it
might be replaced by another identical copy of the device in the
future, but for now the device is gone.

: The "1-newbus-instance : 1-device-instance" assumption is a grave
: mistake, and we shall not lock our selves down in a dogmatic
: postulate about how the world is according to our perception, rather
: we need to be flexible enough to handle all the weird shit (TM)
: out there.

I agree with this.  It is making things difficult to migrate old
device drivers that we have here that don't do that, or have extra
device instances (meta devices) that force all device instances to
have a mapping function to get back to the newbus instance.

Warner


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