Commit f084280c authored Dec 29, 2013 by Rafael J. Wysocki

PCI / ACPI: Install wakeup notify handlers for all PCI devs with ACPI

It turns out that some BIOSes don't report wakeup GPEs through
_PRW, but use them for signaling wakeup anyway, which causes GPE
storms to occur on some systems after resume from system suspend.
This issue has been uncovered by commit d2e5f0c1 (ACPI / PCI:
Rework the setup and cleanup of device wakeup) during the 3.9
development cycle.

Work around the problem by installing wakeup notify handlers for all
PCI devices with ACPI support (i.e. having ACPI companions) regardless
of whether or not the BIOS reports ACPI wakeup support for them.  The
presence of the wakeup notify handlers alone is not harmful in any
way if there are no events for them to handle (they are simply never
executed then), but on some systems they are needed to take care of
spurious events.

Fixes: d2e5f0c1 (ACPI / PCI: Rework the setup and cleanup of device wakeup)
References: https://bugzilla.kernel.org/show_bug.cgi?id=63021


Reported-and-tested-by: Agustin Barto <abarto@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

parent 413541dd

drivers/pci/pci-acpi.c

+12 −9

Original line number	Diff line number	Diff line
		@@ -330,29 +330,32 @@ static int acpi_pci_find_device(struct device dev, acpi_handle handle)
		static void pci_acpi_setup(struct device *dev)
		{
		struct pci_dev *pci_dev = to_pci_dev(dev);
		acpi_handle handle = ACPI_HANDLE(dev);
		struct acpi_device *adev;
		struct acpi_device *adev = ACPI_COMPANION(dev);

		if (acpi_bus_get_device(handle, &adev) \|\| !adev->wakeup.flags.valid)
		if (!adev)
		return;

		pci_acpi_add_pm_notifier(adev, pci_dev);
		if (!adev->wakeup.flags.valid)
		return;

		device_set_wakeup_capable(dev, true);
		acpi_pci_sleep_wake(pci_dev, false);

		pci_acpi_add_pm_notifier(adev, pci_dev);
		if (adev->wakeup.flags.run_wake)
		device_set_run_wake(dev, true);
		}

		static void pci_acpi_cleanup(struct device *dev)
		{
		acpi_handle handle = ACPI_HANDLE(dev);
		struct acpi_device *adev;
		struct acpi_device *adev = ACPI_COMPANION(dev);

		if (!acpi_bus_get_device(handle, &adev) && adev->wakeup.flags.valid) {
		if (!adev)
		return;

		pci_acpi_remove_pm_notifier(adev);
		if (adev->wakeup.flags.valid) {
		device_set_wakeup_capable(dev, false);
		device_set_run_wake(dev, false);
		pci_acpi_remove_pm_notifier(adev);
		}
		}