diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index 1486e03bb41a5a4b3de9d50a887cf10c507bdef5..3721f8dd0de34954dfb697ceb0172c380989fa39 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -57,6 +57,7 @@ MODULE_LICENSE("GPL");
 
 static int acpi_memory_device_add(struct acpi_device *device);
 static int acpi_memory_device_remove(struct acpi_device *device, int type);
+static int acpi_memory_device_start(struct acpi_device *device);
 
 static struct acpi_driver acpi_memory_device_driver = {
 	.name = ACPI_MEMORY_DEVICE_DRIVER_NAME,
@@ -65,6 +66,7 @@ static struct acpi_driver acpi_memory_device_driver = {
 	.ops = {
 		.add = acpi_memory_device_add,
 		.remove = acpi_memory_device_remove,
+		.start = acpi_memory_device_start,
 		},
 };
 
@@ -433,6 +435,25 @@ static int acpi_memory_device_remove(struct acpi_device *device, int type)
 	return_VALUE(0);
 }
 
+static int acpi_memory_device_start (struct acpi_device *device)
+{
+	struct acpi_memory_device *mem_device;
+	int result = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_memory_device_start");
+
+	mem_device = acpi_driver_data(device);
+
+	if (!acpi_memory_check_device(mem_device)) {
+		/* call add_memory func */
+		result = acpi_memory_enable_device(mem_device);
+		if (result)
+			ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+				"Error in acpi_memory_enable_device\n"));
+	}
+	return_VALUE(result);
+}
+
 /*
  * Helper function to check for memory device
  */