From d0e184abc5983281ef189db2c759d65d56eb1b80 Mon Sep 17 00:00:00 2001
From: Bob Moore <robert.moore@intel.com>
Date: Tue, 10 Jun 2008 14:16:47 +0800
Subject: [PATCH] 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: 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>
---
drivers/acpi/resources/rscreate.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/acpi/resources/rscreate.c b/drivers/acpi/resources/rscreate.c
index faddaee1bc075..70c84ece87f1d 100644
--- a/drivers/acpi/resources/rscreate.c
+++ b/drivers/acpi/resources/rscreate.c
@@ -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
--
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