diff --git a/drivers/acpi/nfit.h b/drivers/acpi/nfit.h
index 7e74015..beb4632 100644
--- a/drivers/acpi/nfit.h
+++ b/drivers/acpi/nfit.h
@@ -48,6 +48,7 @@
 struct nfit_spa {
 	struct acpi_nfit_system_address *spa;
 	struct list_head list;
+	int is_registered;
 };
 
 struct nfit_dcr {
@@ -97,6 +98,7 @@
 	struct nvdimm_bus_descriptor nd_desc;
 	struct acpi_table_nfit *nfit;
 	struct mutex spa_map_mutex;
+	struct mutex init_mutex;
 	struct list_head spa_maps;
 	struct list_head memdevs;
 	struct list_head flushes;