ACPICA: Module-level code: enable _REG execution in same scope

This change enables the execution of _REG methods that appear
in the same scope as the module-level code, in resonse to an
operation region declaration within the module-level code.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

drivers/acpi/acpica/acobject.h

@@ -180,7 +180,11 @@ struct acpi_object_method {
 	u8 sync_level;
 	union acpi_operand_object *mutex;
 	u8 *aml_start;
-	ACPI_INTERNAL_METHOD implementation;
+	union {
+		ACPI_INTERNAL_METHOD implementation;
+		union acpi_operand_object *handler;
+	} extra;
+
 	u32 aml_length;
 	u8 thread_count;
 	acpi_owner_id owner_id;

drivers/acpi/acpica/dsmethod.c

@@ -414,7 +414,7 @@ acpi_ds_call_control_method(struct acpi_thread_state *thread,
 	/* Invoke an internal method if necessary */
 
 	if (obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
-		status = obj_desc->method.implementation(next_walk_state);
+		status = obj_desc->method.extra.implementation(next_walk_state);
 		if (status == AE_OK) {
 			status = AE_CTRL_TERMINATE;
 		}

drivers/acpi/acpica/evrgnini.c

@@ -575,6 +575,21 @@ acpi_ev_initialize_region(union acpi_operand_object *region_obj,
 				handler_obj = obj_desc->thermal_zone.handler;
 				break;
 
+			case ACPI_TYPE_METHOD:
+				/*
+				 * If we are executing module level code, the original
+				 * Node's object was replaced by this Method object and we
+				 * saved the handler in the method object.
+				 *
+				 * See acpi_ns_exec_module_code
+				 */
+				if (obj_desc->method.
+				    flags & AOPOBJ_MODULE_LEVEL) {
+					handler_obj =
+					    obj_desc->method.extra.handler;
+				}
+				break;
+
 			default:
 				/* Ignore other objects */
 				break;

drivers/acpi/acpica/nsaccess.c

@@ -165,7 +165,7 @@ acpi_status acpi_ns_root_initialize(void)
 
 				obj_desc->method.method_flags =
 				    AML_METHOD_INTERNAL_ONLY;
-				obj_desc->method.implementation =
+				obj_desc->method.extra.implementation =
 				    acpi_ut_osi_implementation;
 #endif
 				break;

drivers/acpi/acpica/nseval.c

@@ -381,6 +381,18 @@ acpi_ns_exec_module_code(union acpi_operand_object *method_obj,
 				    method_obj->method.next_object);
 	type = acpi_ns_get_type(parent_node);
 
+	/*
+	 * Get the region handler and save it in the method object. We may need
+	 * this if an operation region declaration causes a _REG method to be run.
+	 *
+	 * We can't do this in acpi_ps_link_module_code because
+	 * acpi_gbl_root_node->Object is NULL at PASS1.
+	 */
+	if ((type == ACPI_TYPE_DEVICE) && parent_node->object) {
+		method_obj->method.extra.handler =
+		    parent_node->object->device.handler;
+	}
+
 	/* Must clear next_object (acpi_ns_attach_object needs the field) */
 
 	method_obj->method.next_object = NULL;

drivers/acpi/acpica/psxface.c

@@ -287,7 +287,8 @@ acpi_status acpi_ps_execute_method(struct acpi_evaluate_info *info)
 	/* Invoke an internal method if necessary */
 
 	if (info->obj_desc->method.method_flags & AML_METHOD_INTERNAL_ONLY) {
-		status = info->obj_desc->method.implementation(walk_state);
+		status =
+		    info->obj_desc->method.extra.implementation(walk_state);
 		info->return_object = walk_state->return_desc;
 
 		/* Cleanup states */