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

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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>
This commit is contained in:
Venkatesh Pallipadi
2005-10-23 16:31:00 -04:00
committed by Len Brown
parent d2149b5423
commit 05131ecc99
16 changed files with 243 additions and 231 deletions
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2
include/asm-i386/acpi.h
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@@ -179,7 +179,7 @@ extern void acpi_reserve_bootmem(void);
extern u8 x86_acpiid_to_apicid[];
#define ARCH_HAS_POWER_PDC_INIT 1
#define ARCH_HAS_POWER_INIT 1
#endif /*__KERNEL__*/