From: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Date: Sun, 23 Oct 2005 20:31:00 +0000 (-0400)
Subject: [ACPI] Avoid BIOS inflicted crashes by evaluating _PDC only once
X-Git-Tag: v2.6.16-rc2~1^2~8^2~1^2^7~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=05131ecc99ea9da7f45ba3058fe8a2c1d0ceeab8;p=pandora-kernel.git

[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>
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