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-rw-r--r--drivers/acpi/resources/rscreate.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/acpi/resources/rscreate.c b/drivers/acpi/resources/rscreate.c
index faddaee1bc0..70c84ece87f 100644
--- a/drivers/acpi/resources/rscreate.c
+++ b/drivers/acpi/resources/rscreate.c
@@ -285,6 +285,23 @@ 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
*/