Messages in this thread Patch in this message | | | Date | Wed, 18 Jun 2008 22:13:00 -0400 (EDT) | From | Len Brown <> | Subject | [stable PATCH 2.6.21] ACPICA: Ignore ACPI table signature for Load() operator |
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From: Bob Moore <robert.moore@intel.com>
upstream bc45b1d39a925b56796bebf8a397a0491489d85c
Only "SSDT" is acceptable to the ACPI spec, but tables are seen with OEMx and null sigs. Therefore, signature validation is worthless. Apparently MS ACPI accepts such signatures, ACPICA must be compatible.
Without this patch booting with acpi_osi="!Windows 2006" is required for several machines to function properly with cpufreq.
http://bugzilla.kernel.org/show_bug.cgi?id=9919 http://bugzilla.kernel.org/show_bug.cgi?id=10383 http://bugzilla.kernel.org/show_bug.cgi?id=10454 https://bugzilla.novell.com/show_bug.cgi?id=396311
Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Len Brown <len.brown@intel.com> --- drivers/acpi/tables/tbinstal.c | 25 +++++++------------------ 1 files changed, 7 insertions(+), 18 deletions(-)
Index: linux-2.6.21.y/drivers/acpi/tables/tbinstal.c =================================================================== --- linux-2.6.21.y.orig/drivers/acpi/tables/tbinstal.c +++ linux-2.6.21.y/drivers/acpi/tables/tbinstal.c @@ -123,17 +123,13 @@ acpi_tb_add_table(struct acpi_table_desc } } - /* The table must be either an SSDT or a PSDT */ - - if ((!ACPI_COMPARE_NAME(table_desc->pointer->signature, ACPI_SIG_PSDT)) - && - (!ACPI_COMPARE_NAME(table_desc->pointer->signature, ACPI_SIG_SSDT))) - { - ACPI_ERROR((AE_INFO, - "Table has invalid signature [%4.4s], must be SSDT or PSDT", - table_desc->pointer->signature)); - return_ACPI_STATUS(AE_BAD_SIGNATURE); - } + /* + * Originally, we checked the table signature for "SSDT" or "PSDT" here. + * Next, we added support for OEMx tables, signature "OEM". + * Valid tables were encountered with a null signature, so we've just + * given up on validating the signature, since it seems to be a waste + * of code. The original code was removed (05/2008). + */ (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
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