linux-kernel - Re: [PATCH 4/4] ACPI PCI slot detection driver

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Date:	Mon, 3 Mar 2008 21:49:27 -0800
From:	Greg KH <gregkh@...e.de>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Alex Chiang <achiang@...com>, Gary Hade <garyhade@...ibm.com>,
	kaneshige.kenji@...fujitsu.com, warthog19@...lescrag.net,
	kristen.c.accardi@...el.com, rick.jones2@...com,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 4/4] ACPI PCI slot detection driver

On Sat, Mar 01, 2008 at 07:43:07AM -0700, Matthew Wilcox wrote:
> On Fri, Feb 29, 2008 at 09:25:42PM -0800, Greg KH wrote:
> > What is the guarantee that the names of these slots are correct and do
> > not happen to be the same as the hotpluggable ones?
> 
> That would be a bug -- and yes, bugs happen, and we have to deal with
> them.

My main concern is that BIOS vendors will not fix these bugs, as no
other OS cares/does this kind of thing today.  The ammount of bad
information out there might be quite large, and I think this was
confirmed by some initial testing of IBM systems, right?

> > Why show this information on machines that can not do anything with
> > these slots at all?  Will that not just confuse people?
> 
> Only for people who think that /sys/bus/pci/slots/ is for hotpluggable
> slots only.  There is plenty of useful information available for slots
> that aren't hotpluggable (eg bus address, speed, width, error status).

Can the userspace tools that are using the existing directories thinking
that only hotplug slots are there, handle "non-hotplug" slots showing up
in this location?

thanks,

greg k-h
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