ACPICA: Events: Split acpi_ev_associate_reg_method() from region initialization code

ACPICA commit 87c85610250ff7141a84507f68dbc1e00f2936db

This patch introduces a new region initialization function
acpi_ev_associate_reg_method(), which is invoked to associate the _REG method
to its related region object.

Region object's default value assignments are also sorted by cleaning up
the code using this new function. Lv Zheng.

Link: https://github.com/acpica/acpica/commit/87c85610
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpica/evregion.c

@@ -527,6 +527,52 @@ acpi_ev_attach_region(union acpi_operand_object *handler_obj,
 	return_ACPI_STATUS(AE_OK);
 }
 
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ev_associate_reg_method
+ *
+ * PARAMETERS:  region_obj          - Region object
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Find and associate _REG method to a region
+ *
+ ******************************************************************************/
+
+void acpi_ev_associate_reg_method(union acpi_operand_object *region_obj)
+{
+	acpi_name *reg_name_ptr = (acpi_name *) METHOD_NAME__REG;
+	struct acpi_namespace_node *method_node;
+	struct acpi_namespace_node *node;
+	union acpi_operand_object *region_obj2;
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(ev_associate_reg_method);
+
+	region_obj2 = acpi_ns_get_secondary_object(region_obj);
+	if (!region_obj2) {
+		return_VOID;
+	}
+
+	node = region_obj->region.node->parent;
+
+	/* Find any "_REG" method associated with this region definition */
+
+	status =
+	    acpi_ns_search_one_scope(*reg_name_ptr, node, ACPI_TYPE_METHOD,
+				     &method_node);
+	if (ACPI_SUCCESS(status)) {
+		/*
+		 * The _REG method is optional and there can be only one per region
+		 * definition. This will be executed when the handler is attached
+		 * or removed
+		 */
+		region_obj2->extra.method_REG = method_node;
+	}
+
+	return_VOID;
+}
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_ev_execute_reg_method