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Date:	Sat, 6 Feb 2010 01:20:43 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	"Moore, Robert" <robert.moore@...el.com>,
	Matthew Garrett <mjg@...hat.com>, Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Oliver Neukum <oliver@...kum.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Gary Hade <garyhade@...ibm.com>
Subject: Re: [PATCH 8/9] PCI / ACPI / PM: Platform support for PCI PME wake-up (rev. 7)

On Saturday 06 February 2010, Bjorn Helgaas wrote:
> On Sunday 10 January 2010 07:01:03 am Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki <rjw@...k.pl>
> > 
> > Although the majority of PCI devices can generate PMEs that in
> > principle may be used to wake up devices suspended at run time,
> > platform support is generally necessary to convert PMEs into wake-up
> > events that can be delivered to the kernel.  If ACPI is used for this
> > purpose, a PME generated by a PCI device will trigger the ACPI GPE
> > associated with the device to generate an ACPI wake-up event that we
> > can set up a handler for, provided that everything is configured
> > correctly.
> 
> I think acpiphp needs a little attention after this patch.  Gary
> Hade noticed while testing Jesse's linux-next branch that acpiphp
> complains like this:
> 
>   acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
>   acpiphp: Slot [9] registered
>   acpiphp: Slot [10] registered
>   acpiphp_glue: failed to register interrupt notify handler
>   acpiphp: Slot [6] registered
>   acpiphp_glue: failed to register interrupt notify handler
> 
> I reproduced this on an HP rx3600 (ia64), and found that acpiphp
> doesn't complain on commit 82533a617f453, but it *does* complain
> on commit fb3383bb4ac6e, which seems to be this patch.
> 
> I haven't tried to debug it any farther than just noticing that
> acpiphp starts complaining here, so I don't know what the right
> fix is, or even if acpiphp is really broken.
> 
> I did use acpiphp to power-cycle a slot ("echo 0 > power"), and
> it seemed to work despite the warnings.  But I guess the notification
> is probably not involved in that path; I suppose the notification
> is like a latch or attention button interrupt or something.

Thanks for the report, I'll look at this tomorrow.

Rafael
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