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SubjectRe: [RFC][PATCH 3/4] PCI / ACPI PM: Platform support for PCI PME wake-up
Date
On Monday 14 September 2009, Matthew Garrett wrote:
> 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.

You're right, I overlooked that. Some kind of refcounting is needed here.

> > + 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.

The root bridge is not a struct pci_dev and this is called only for these.

Thanks,
Rafael


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