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Date: Sun, 23 Feb 2003 16:59:03 -0800 (PST)
From: Linus Torvalds <torvalds@transmeta.com>
To: Russell King <rmk@arm.linux.org.uk>
cc: Scott Murray <scottm@somanetworks.com>, <linux-kernel@vger.kernel.org>,
       Jeff Garzik <jgarzik@pobox.com>, Greg KH <greg@kroah.com>
Subject: Re: [PATCH] Make hot unplugging of PCI buses work
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On Sun, 23 Feb 2003, Russell King wrote:
> 
> However, whether x86 PCs will survive bus renumbering or not remains to
> be seen.  We currently try to leave as much of the configuration intact
> from the BIOS.

Note that I made cardbus bus numbering _ignore_ the BIOS-setup numbering 
even on PC's, exactly because of issues like this - trying to keep the 
original BIOS numbering just won't work if the BIOS sets the wrong numbers 
(I saw a BIOS that had happily assigned the _same_ PCI bus number to both 
cardbus functions, whee).

I think we can (and should) make all hotpluggable PCI bridges use that 
same cardbus logic.

The real problematic case I see is if there are transparent hotplug
bridges, with some devices just magically appear and disappear from a part 
of a bus because of some invisible bridge. I don't know if such things 
exist or even _can_ exist, but the perverse nature of PC hardware makes me 
suspect they do.

			Linus

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