diff options
| author | Andrew Patterson <andrew.patterson@hp.com> | 2008-01-22 17:18:27 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-02-01 15:04:30 -0800 |
| commit | 3c75e23784e6ed5f4841de43d0750fd9b37bafcb (patch) | |
| tree | 34c54566b3dfe8411464f49bdaec0cbcdd7170e9 /drivers/pci | |
| parent | d8634ddd371515740110d5658c3465a373894243 (diff) | |
| download | linux-3c75e23784e6ed5f4841de43d0750fd9b37bafcb.tar.gz | |
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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pcie/aer/aerdrv_acpi.c | 22 |
1 files changed, 6 insertions, 16 deletions
diff --git a/drivers/pci/pcie/aer/aerdrv_acpi.c b/drivers/pci/pcie/aer/aerdrv_acpi.c index f685bf5cdab9..8c199ae84f6d 100644 --- a/drivers/pci/pcie/aer/aerdrv_acpi.c +++ b/drivers/pci/pcie/aer/aerdrv_acpi.c @@ -31,23 +31,13 @@ int aer_osc_setup(struct pcie_device *pciedev) { acpi_status status = AE_NOT_FOUND; struct pci_dev *pdev = pciedev->port; - acpi_handle handle = DEVICE_ACPI_HANDLE(&pdev->dev); - struct pci_bus *parent; + acpi_handle handle = 0; - while (!handle) { - if (!pdev || !pdev->bus->parent) - break; - parent = pdev->bus->parent; - if (!parent->self) - /* 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; - } + /* Find root host bridge */ + while (pdev->bus && pdev->bus->self) + pdev = pdev->bus->self; + handle = acpi_get_pci_rootbridge_handle( + pci_domain_nr(pdev->bus), pdev->bus->number); if (handle) { pcie_osc_support_set(OSC_EXT_PCI_CONFIG_SUPPORT); |