ACPICA: Fixes for Unload and DDBHandles

Implemented support for the use of DDBHandles as an Indexed
Reference, as per the ACPI spec.

http://www.acpica.org/bugzilla/show_bug.cgi?id=486.

Implemented support for UserTerm (Method invocation) for the Unload operator
as per the ACPI spec.

http://www.acpica.org/bugzilla/show_bug.cgi?id=580

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Alexey Starikovskiy <astarikovskiy@suse.de>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 18 insertions, 5 deletions

diff --git a/drivers/acpi/executer/exstore.c b/drivers/acpi/executer/exstore.c
index 2408122cb3b2..725614e277f8 100644
--- a/drivers/acpi/executer/exstore.c
+++ b/drivers/acpi/executer/exstore.c
@@ -434,11 +434,24 @@ acpi_ex_store_object_to_index(union acpi_operand_object *source_desc,
                  */
                 obj_desc = *(index_desc->reference.where);
 
-                status =
-                    acpi_ut_copy_iobject_to_iobject(source_desc, &new_desc,
-                                                    walk_state);
-                if (ACPI_FAILURE(status)) {
-                        return_ACPI_STATUS(status);
+                if (ACPI_GET_OBJECT_TYPE(source_desc) ==
+                    ACPI_TYPE_LOCAL_REFERENCE
+                    && source_desc->reference.opcode == AML_LOAD_OP) {
+
+                        /* This is a DDBHandle, just add a reference to it */
+
+                        acpi_ut_add_reference(source_desc);
+                        new_desc = source_desc;
+                } else {
+                        /* Normal object, copy it */
+
+                        status =
+                            acpi_ut_copy_iobject_to_iobject(source_desc,
+                                                            &new_desc,
+                                                            walk_state);
+                        if (ACPI_FAILURE(status)) {
+                                return_ACPI_STATUS(status);
+                        }
                 }
 
                 if (obj_desc) {