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Commit d0e184ab authored by Bob Moore's avatar Bob Moore Committed by Andi Kleen
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ACPICA: Workaround for reversed _PRT entries from BIOS 



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: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
parent b25d2a47

drivers/acpi/resources/rscreate.c

+17 −0
Original line number Diff line number Diff line
@@ -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

		 * The name may be unresolved (slack mode), so allow a null object