From owner-cvs-all  Mon Jul  3  9:40:50 2000
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To: Garrett Wollman <wollman@khavrinen.lcs.mit.edu>
Cc: Warner Losh <imp@village.org>,
	Nick Hibma <n_hibma@calcaphon.com>, cvs-committers@FreeBSD.org,
	cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/sys bus.h bus_private.h src/sys/kern subr_bus.c 
In-reply-to: Your message of "Mon, 03 Jul 2000 12:34:53 EDT."
             <200007031634.MAA17071@khavrinen.lcs.mit.edu> 
Date: Mon, 03 Jul 2000 18:40:23 +0200
Message-ID: <7096.962642423@critter.freebsd.dk>
From: Poul-Henning Kamp <phk@critter.freebsd.dk>
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In message <200007031634.MAA17071@khavrinen.lcs.mit.edu>, Garrett Wollman write
s:
><<On Mon, 03 Jul 2000 10:04:55 -0600, Warner Losh <imp@village.org> said:
>
>> 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.
>
>I think this is a bug in pccard (or rather, in the way removable
>devices are currently implemented in newbus).  If I reinsert the same
>(or a functionally identical) device, I should be able to expect it to
>start off from where it was before.
>
>In other words, devices which are removed need to be accounted for as
>``still attached but not physically present'' rather than simply
>``gone''.

It's a hard call, and I'm not sure it is the best idea to decide this
on a global basis: ie, the model we use for ethernets and disks may
be radically different.

In a way I like the way Windows did this, by having a set of 
configurations, ie: undocked, docked, undocked + pccard etc etc

In fact the best idea may be to make this a per device variable:

	"if your hardware disappears, stay around"
or
	"if your hardware disappears, go away"

--
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD coreteam member | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.


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