linux-kernel - Re: [PATCH 8/9] PCI / ACPI / PM: Platform support for PCI PME wake-up (rev. 7)

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Message-Id: <201002082017.14631.rjw@sisk.pl>
Date:	Mon, 8 Feb 2010 20:17:14 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Gary Hade <garyhade@...ibm.com>
Cc:	Bjorn Helgaas <bjorn.helgaas@...com>,
	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>
Subject: Re: [PATCH 8/9] PCI / ACPI / PM: Platform support for PCI PME wake-up (rev. 7)

On Monday 08 February 2010, Gary Hade wrote:
> On Sat, Feb 06, 2010 at 09:11:56PM +0100, Rafael J. Wysocki wrote:
> > 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 can't see the possible reason looking at the code alone.
> > 
> > Could you add a debug printk() printing the error code returned by
> > pci_acpi_add_hp_notifier() in acpiphp_glue.c:register_slot(), please?
> 
> Rafael, On the system where I ran into the problem it returns
> AE_NOT_FOUND.  See below.

Thanks!

Well, that means there's no struct acpi_device object associated with handle.

I must admit I didn't take that into consideration, but it should be easily
fixable.  I'll send a patch for that later today.

Rafael
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