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PCI: Run ACPI _OSC method on root bridges only
According to the PCI Firmware Specification Revision 3.0 section 4.5, _OSC should only be called on a root brdige. Here is the relevant passage: "The _OSC interface defined in this section applies only to Host Bridge ACPI devices that originate PCI, PCI-X, or PCI Express hierarchies". Changed the code to find the parent root bridge of the device and call _OSC on that. Signed-off-by: Andrew Patterson <andrew.patterson@hp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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@ -31,23 +31,13 @@ int aer_osc_setup(struct pcie_device *pciedev)
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{
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acpi_status status = AE_NOT_FOUND;
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struct pci_dev *pdev = pciedev->port;
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acpi_handle handle = DEVICE_ACPI_HANDLE(&pdev->dev);
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struct pci_bus *parent;
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acpi_handle handle = 0;
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while (!handle) {
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if (!pdev || !pdev->bus->parent)
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break;
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parent = pdev->bus->parent;
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if (!parent->self)
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/* Parent must be a host bridge */
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handle = acpi_get_pci_rootbridge_handle(
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pci_domain_nr(parent),
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parent->number);
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else
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handle = DEVICE_ACPI_HANDLE(
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&(parent->self->dev));
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pdev = parent->self;
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}
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/* Find root host bridge */
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while (pdev->bus && pdev->bus->self)
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pdev = pdev->bus->self;
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handle = acpi_get_pci_rootbridge_handle(
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pci_domain_nr(pdev->bus), pdev->bus->number);
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if (handle) {
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pcie_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT);
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