From: Len Brown <len.brown@intel.com>
Date: Fri, 6 Feb 2009 19:00:56 +0000 (-0500)
Subject: ACPI: disable ACPI cleanly when bad RSDP found
X-Git-Tag: v2.6.29-rc4~7^2^6~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9e3a9d1ed8cc8db93e5c53e9a5b09065bd95de8b;p=pandora-kernel.git

ACPI: disable ACPI cleanly when bad RSDP found

When ACPI is disabled in the BIOS of this VIA C3 box,
it invalidates the RSDP, which Linux notices:

ACPI Error (tbxfroot-0218): A valid RSDP was not found [20080926]

Bug Linux neglected to disable ACPI at that stage,
and later scribbled on smp_found_config:

ACPI: No APIC-table, disabling MPS

But this box doesn't run well in legacy PIC mode,
it needed IOAPIC mode to perform correctly:

http://lkml.org/lkml/2009/2/5/39

So exit ACPI mode cleanly when we first detect
that it is hopeless.

Signed-off-by: Len Brown <len.brown@intel.com>
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