On Fri, Sep 13, 2013 at 7:38 PM, Rafael J. Wysocki <rjw@xxxxxxx> wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
>
> Commit 448bd85 (PCI/PM: add PCIe runtime D3cold support) added a
> piece of code to pci_acpi_wake_dev() causing that function to behave
> in a special way for devices in D3cold (so that their configuration
> registeres are not accessed before those devices are resumed).
s/registeres/registers/
> However, it didn't take the clearing of the pme_poll flag into
> account. That has to be done for all devices, even if they are in
> D3cold, or pci_pme_list_scan() will not know that wakeup has been
> signaled for the device and will poll its PME Status bit
> unnecessarily.
>
> Fix the problem by moving the clearing of the pme_poll flag in
> pci_acpi_wake_dev() before the code introduced by commit 448bd85.
>
> Reported-and-tested-by: David E. Box <david.e.box@xxxxxxxxx>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> Cc: 3.6+ <stable@xxxxxxxxxxxxxxx> # 3.6+
> ---
> drivers/pci/pci-acpi.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> Index: linux-pm/drivers/pci/pci-acpi.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/pci-acpi.c
> +++ linux-pm/drivers/pci/pci-acpi.c
> @@ -47,6 +47,9 @@ static void pci_acpi_wake_dev(acpi_handl
> if (event != ACPI_NOTIFY_DEVICE_WAKE || !pci_dev)
> return;
>
> + if (pci_dev->pme_poll)
> + pci_dev->pme_poll = false;
> +
> if (pci_dev->current_state == PCI_D3cold) {
> pci_wakeup_event(pci_dev);
> pm_runtime_resume(&pci_dev->dev);
> @@ -57,9 +60,6 @@ static void pci_acpi_wake_dev(acpi_handl
> if (pci_dev->pme_support)
> pci_check_pme_status(pci_dev);
>
> - if (pci_dev->pme_poll)
> - pci_dev->pme_poll = false;
> -
> pci_wakeup_event(pci_dev);
> pm_runtime_resume(&pci_dev->dev);
>
>
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