ACPICA: Add repair for predefined methods that return nested packages
Fixes a problem where a predefined method is defined to return
a variable-length Package of sub-packages. If the length is one,
the BIOS code occasionally creates a simple single package with
no sub-packages. This code attempts to fix the problem by wrapping
a new package object around the existing package. ACPICA BZ 790.
http://acpica.org/bugzilla/show_bug.cgi?id=790
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>
diff --git a/drivers/acpi/acpica/nsrepair.c b/drivers/acpi/acpica/nsrepair.c
index b64751e..db2b2a9 100644
--- a/drivers/acpi/acpica/nsrepair.c
+++ b/drivers/acpi/acpica/nsrepair.c
@@ -149,3 +149,55 @@
return (AE_AML_OPERAND_TYPE);
}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ns_repair_package_list
+ *
+ * PARAMETERS: Data - Pointer to validation data structure
+ * obj_desc_ptr - Pointer to the object to repair. The new
+ * package object is returned here,
+ * overwriting the old object.
+ *
+ * RETURN: Status, new object in *obj_desc_ptr
+ *
+ * DESCRIPTION: Repair a common problem with objects that are defined to return
+ * a variable-length Package of Packages. If the variable-length
+ * is one, some BIOS code mistakenly simply declares a single
+ * Package instead of a Package with one sub-Package. This
+ * function attempts to repair this error by wrapping a Package
+ * object around the original Package, creating the correct
+ * Package with one sub-Package.
+ *
+ * Names that can be repaired in this manner include:
+ * _ALR, _CSD, _HPX, _MLS, _PRT, _PSS, _TRT, TSS
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ns_repair_package_list(struct acpi_predefined_data *data,
+ union acpi_operand_object **obj_desc_ptr)
+{
+ union acpi_operand_object *pkg_obj_desc;
+
+ /*
+ * Create the new outer package and populate it. The new package will
+ * have a single element, the lone subpackage.
+ */
+ pkg_obj_desc = acpi_ut_create_package_object(1);
+ if (!pkg_obj_desc) {
+ return (AE_NO_MEMORY);
+ }
+
+ pkg_obj_desc->package.elements[0] = *obj_desc_ptr;
+
+ /* Return the new object in the object pointer */
+
+ *obj_desc_ptr = pkg_obj_desc;
+ data->flags |= ACPI_OBJECT_REPAIRED;
+
+ ACPI_WARN_PREDEFINED((AE_INFO, data->pathname, data->node_flags,
+ "Incorrectly formed Package, attempting repair"));
+
+ return (AE_OK);
+}