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ACPICA: Workaround for reversed _PRT entries from BIOS

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Some BIOSs erroneously reverse the _PRT SourceName and the
SourceIndex.  Detect and repair this problem. MS ACPI also allows
and repairs this problem, thus ACPICA must also.

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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Bob Moore 2008-06-10 14:16:47 +08:00 committed by Andi Kleen
parent b25d2a470b
commit d0e184abc5
1 changed files with 17 additions and 0 deletions
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17
drivers/acpi/resources/rscreate.c
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@ -284,6 +284,23 @@ acpi_rs_create_pci_routing_table(union acpi_operand_object *package_object,
} }
} }
/*
* If the BIOS has erroneously reversed the _PRT source_name (index 2)
* and the source_index (index 3), fix it. _PRT is important enough to
* workaround this BIOS error. This also provides compatibility with
* other ACPI implementations.
*/
obj_desc = sub_object_list[3];
if (!obj_desc
|| (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_INTEGER)) {
sub_object_list[3] = sub_object_list[2];
sub_object_list[2] = obj_desc;
ACPI_WARNING((AE_INFO,
"(PRT[%X].Source) SourceName and SourceIndex are reversed, fixed",
index));
}
/* /*
* 3) Third subobject: Dereference the PRT.source_name * 3) Third subobject: Dereference the PRT.source_name
* The name may be unresolved (slack mode), so allow a null object * The name may be unresolved (slack mode), so allow a null object