tree dec76975406874cf677d6391302f42a6da55ac38
parent d2149b542382bfc206cb28485108f6470c979566
author Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> 1130099460 -0400
committer Len Brown <len.brown@intel.com> 1133418635 -0500

[ACPI] Avoid BIOS inflicted crashes by evaluating _PDC only once

Linux invokes the AML _PDC method (Processor Driver Capabilities)
to tell the BIOS what features it can handle.  While the ACPI
spec says nothing about the OS invoking _PDC multiple times,
doing so with changing bits seems to hopelessly confuse the BIOS
on multiple platforms up to and including crashing the system.

Factor out the _PDC invocation so Linux invokes it only once.

http://bugzilla.kernel.org/show_bug.cgi?id=5483

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>