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| author | Bob Moore <robert.moore@intel.com> | 2008-06-10 14:16:47 +0800 |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2008-07-16 23:27:04 +0200 |
| commit | d0e184abc5983281ef189db2c759d65d56eb1b80 (patch) | |
| tree | 48ec8b44dcfec1e5c537997f115b21c887da1e52 | |
| parent | b25d2a470bc9ffef4c34248952d914bd6fc0fcf6 (diff) | |
| download | linux-d0e184abc5983281ef189db2c759d65d56eb1b80.tar.bz2 | |
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>
| -rw-r--r-- | drivers/acpi/resources/rscreate.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/acpi/resources/rscreate.c b/drivers/acpi/resources/rscreate.c index faddaee1bc07..70c84ece87f1 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 */ |