linux-kernel - RE: one more ACPI Error (utglobal-0125): Unknown exception code: 0xFFFFFFEA [Re: 2.6.18-rc4-mm3]

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Date:	Wed, 6 Sep 2006 11:59:47 -0700
From:	"Moore, Robert" <robert.moore@...el.com>
To:	<kmannth@...ibm.com>, "Bjorn Helgaas" <bjorn.helgaas@...com>
Cc:	"Len Brown" <lenb@...nel.org>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	"Mattia Dongili" <malattia@...ux.it>,
	"Andrew Morton" <akpm@...l.org>,
	"lkml" <linux-kernel@...r.kernel.org>,
	"linux acpi" <linux-acpi@...r.kernel.org>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Subject: RE: one more ACPI Error (utglobal-0125): Unknown exception code: 0xFFFFFFEA [Re: 2.6.18-rc4-mm3]

>From one of the ACPI guys:

> Get hid
> Look for driver
> If you find a match, load it
> If no match, get CID
> Look for driver
> If you find a match, load it
> If you did not find an hid or cid match, punt



> -----Original Message-----
> From: linux-acpi-owner@...r.kernel.org [mailto:linux-acpi-
> owner@...r.kernel.org] On Behalf Of keith mannthey
> Sent: Wednesday, September 06, 2006 11:14 AM
> To: Bjorn Helgaas
> Cc: Len Brown; Moore, Robert; Li, Shaohua; Mattia Dongili; Andrew
Morton;
> lkml; linux acpi; KAMEZAWA Hiroyuki
> Subject: Re: one more ACPI Error (utglobal-0125): Unknown exception
code:
> 0xFFFFFFEA [Re: 2.6.18-rc4-mm3]
> 
> On Fri, 2006-09-01 at 17:20 -0600, Bjorn Helgaas wrote:
> > On Friday 01 September 2006 17:01, keith mannthey wrote:
> > > On Thu, 2006-08-31 at 21:15 -0600, Bjorn Helgaas wrote:
> > > > The current ACPI driver binding algorithm in
acpi_bus_find_driver()
> > > > looks at each driver, checking whether it can match either the
_HID
> > > > or the _CID of a device.  Since we try the motherboard driver
first,
> > > > it matches the memory device _CID.
> > >
> > > Ok I reverted the motherboard driver patch and cooked up the
following
> > > patch that works for my issue.
> > >
> > >   It creates the idea that acpi_match_ids has a type of request to
> check
> > > against for _HID, _CID or both.  See acpi_bus_match_req. I then
fix up
> > > all the needed callers to change the API to acpi_match_ids and
> > > acpi_bus_match and have callers can say what they want to match
> > > against.
> > >
> > >   Then in acpi_bus_find_driver I have it do 2 passes to search for
> _HID
> > > first then the _CID.
> > >
> > > Does this look like it is in the right ballpark or should we be
doing
> > > something else?  Built/tested against 2.6.18-rc4-mm3.
> >
> > Conceptually I like this much better than mucking with the
motherboard
> > driver.  I'm not sure the important people have signed off on this
> > strategy of binding with _HID first, then _CID (hi, Len :-))  Maybe
> > there are ramifications that we need to consider.  But I think it
> > is a better match for "what people expect should happen."
> 
> ACPI folks can we get some response to this?  This problem has been
> reported a few times against the -mm tree and I would like to get the
> proper fix (whatever it is) upstream sometime soon.
> 
> Bjorn thanks for the help and for pointing the error reports in the
> right direction.
> 
> Thanks,
>   Keith
> 
> 
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