linux-kernel - Re: [RFC][PATCH 3/4] PCI / ACPI PM: Platform support for PCI PME wake-up

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Date:	Sun, 13 Sep 2009 23:25:05 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	pm list <linux-pm@...ts.linux-foundation.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Shaohua Li <shaohua.li@...el.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [RFC][PATCH 3/4] PCI / ACPI PM: Platform support for PCI PME
	wake-up

On Sun, Sep 13, 2009 at 11:24:03PM +0200, Rafael J. Wysocki wrote:
> +	} else if (!dev->wakeup.flags.run_wake) {
> +		acpi_set_gpe_type(dev->wakeup.gpe_device,
> +					dev->wakeup.gpe_number,
> +					ACPI_GPE_TYPE_WAKE);

Is this going to work for cases where we have multiple devices attached 
to the same GPE? The common one is EHCI, where both EHCI HCDs will be 
one a single GPE. If we wake one, that'll then disable the GPE for the 
other. Further wakeup events will then be lost.

> +	if (device->wakeup.flags.valid)
> +		acpi_install_notify_handler(device->handle, ACPI_SYSTEM_NOTIFY,
> +						pci_acpi_device_wakeup,
> +						&dev->dev);
> +

I think this will fail for the root bridge if acpiphp has already 
grabbed it to check for hotplug events.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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