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

[Bjorn Helgaas <bjorn.helgaas-VXdhtT5mjnY@public.gmane.org>]

On Wednesday 28 April 2004 8:53 am, Simon Derr wrote:
> On Wed, 28 Apr 2004, Matthew Wilcox wrote:
> 
> > Sounds like you have a bug.  Why does your firmware not report that the
> > device is present?
> >
> Yes there is very probably some firmware bug involved, and as a matter of
> fact we happen to have a 16-way system where the 0xff bus is visible even
> with recent kernels.

Is your box based on Intel chipsets and/or firmware?  You might be
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".

Nobody cared enough to do anything about this issue at the time, so
it is still broken.  I did raise the issue with our ACPI representative,
but I don't know what happened.  I'd like to see some clarification in
the spec.


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