Re: [PATCH] fix(Fix _STA checking in acpi_bus_add)

[Bruno Ducrot <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org>]

On Thu, Apr 29, 2004 at 08:46:41AM -0600, Bjorn Helgaas wrote:
> On Thursday 29 April 2004 2:18 am, Simon Derr wrote:
> > On Wed, 28 Apr 2004, Bjorn Helgaas wrote:
> > 
> > > Is your box based on Intel chipsets and/or firmware?  You might be
> > Indeed.
> > 
> > > suffering from the problem I described here:
> > >
> > >     https://sourceforge.net/mailarchive/message.php?msg_id=6923358
> > >
> > > Intel firmware seems to describe the PCI root bridge where chipset
> > > configuration space lives with _STA==0x8.  The spec says this means
> > > "functional, but not present".  The current Linux code ignores things
> > > that are "not present".
> > 
> > I tried your patch and it works perfectly. Thank you.
> > This chipset/firmware is probably very common in the ia64 world so I think
> > it might be a good idea to include your patch in the stock Linux kernel.
> 
> Well, the patch is a gross hack for a special case, and I'd be worried
> about it breaking something related to docking or hotplug.  That's why
> I posted it as "RFC" first, in the hope that someone could explain the
> intent behind the Intel firmware.

Note that my previous post is how I interpret the specs.  I can be
completely wrong, and thinks like breaking docking etc. is only based on
my interpretation.

> Given the current ACPI spec, I'd say it's a bug in the Intel firmware,
> and any workaround should be specific to that firmware.  If Intel
> figures out good semantics for what they're trying to do, I think that
> should be reflected in a future spec.

It's up to real ACPI experts, like Bob, to tell actually what means
exactly that funny 0x8 returned from _STA.

-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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