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3c75e23784
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>