Re: [PATCH 3/7] PCI/PM: Clear PCIe PME Status even for legacy power management

Rafael J. Wysocki
2019-10-15T17:20:16Z

On Tuesday, October 15, 2019 1:00:12 AM CEST Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@google.com>
>
> Previously, pci_pm_resume_noirq() cleared the PME Status bit in the Root
> Status register only if the device had no driver or the driver did not
> implement legacy power management. It should clear PME Status regardless
> of what sort of power management the driver supports, so do this before
> checking for legacy power management.
>
> This affects Root Ports and Root Complex Event Collectors, for which the
> usual driver is the PCIe portdrv, which implements new power management, so
> this change is just on principle, not to fix any actual defects.
>
> Fixes: a39bd851dccf ("PCI/PM: Clear PCIe PME Status bit in core, not PCIe port driver")
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

This is a reasonable change in my view, so

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

> ---
> drivers/pci/pci-driver.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
> index d4ac8ce8c1f9..0c3086793e4e 100644
> --- a/drivers/pci/pci-driver.c
> +++ b/drivers/pci/pci-driver.c
> @@ -941,12 +941,11 @@ static int pci_pm_resume_noirq(struct device *dev)
> pci_pm_default_resume_early(pci_dev);
>
> pci_fixup_device(pci_fixup_resume_early, pci_dev);
> + pcie_pme_root_status_cleanup(pci_dev);
>
> if (pci_has_legacy_pm_support(pci_dev))
> return pci_legacy_resume_early(dev);
>
> - pcie_pme_root_status_cleanup(pci_dev);
> -
> if (drv && drv->pm && drv->pm->resume_noirq)
> error = drv->pm->resume_noirq(dev);
>
>