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PCI: Run ACPI _OSC method on root bridges only

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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>
This commit is contained in:
Andrew Patterson 2008-01-22 17:18:27 -07:00 committed by Greg Kroah-Hartman
parent d8634ddd37
commit 3c75e23784
1 changed files with 6 additions and 16 deletions
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22
drivers/pci/pcie/aer/aerdrv_acpi.c
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@ -31,23 +31,13 @@ int aer_osc_setup(struct pcie_device *pciedev)
{ {
acpi_status status = AE_NOT_FOUND; acpi_status status = AE_NOT_FOUND;
struct pci_dev *pdev = pciedev->port; struct pci_dev *pdev = pciedev->port;
acpi_handle handle = DEVICE_ACPI_HANDLE(&pdev->dev); acpi_handle handle = 0;
struct pci_bus *parent;
while (!handle) { /* Find root host bridge */
if (!pdev || !pdev->bus->parent) while (pdev->bus && pdev->bus->self)
break; pdev = pdev->bus->self;
parent = pdev->bus->parent; handle = acpi_get_pci_rootbridge_handle(
if (!parent->self) pci_domain_nr(pdev->bus), pdev->bus->number);
/* Parent must be a host bridge */
handle = acpi_get_pci_rootbridge_handle(
pci_domain_nr(parent),
parent->number);
else
handle = DEVICE_ACPI_HANDLE(
&(parent->self->dev));
pdev = parent->self;
}
if (handle) { if (handle) {
pcie_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT); pcie_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT);