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ACPICA: Remove use of unreliable FADT revision field

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The revision number in the FADT has been found to be completely
unreliable and cannot be trusted. Only the table length can be
used to infer the actual version.

Signed-off-by: Bob Moore <[email protected]>
Signed-off-by: Lin Ming <[email protected]>
Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Bob Moore 2011-02-14 15:50:42 +08:00 • committed by Len Brown
commit 64b3db22c0
2 changed files with 20 additions and 1 deletions
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5
drivers/acpi/acpica/tbfadt.c
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@ -384,8 +384,11 @@ static void acpi_tb_convert_fadt(void)
*
* The ACPI 1.0 reserved fields that will be zeroed are the bytes located at
* offset 45, 55, 95, and the word located at offset 109, 110.
*
* Note: The FADT revision value is unreliable. Only the length can be
* trusted.
*/
if (acpi_gbl_FADT.header.revision < FADT2_REVISION_ID) {
if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
acpi_gbl_FADT.preferred_profile = 0;
acpi_gbl_FADT.pstate_control = 0;
acpi_gbl_FADT.cst_control = 0;