ACPI: memhotplug: Remove 'state' from struct acpi_memory_device

After commit 315bbae9 ("ACPI / memhotplug: deal with eject request
in hotplug queue"), the memory device state, which is defined in
struct acpi_memory_device, is not actually useful, so remove it along
with symbols related to it.
Signed-off-by: Hanjun Guo <guohanjun@huawei.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/acpi_memhotplug.c

@@ -36,11 +36,6 @@ static const struct acpi_device_id memory_device_ids[] = {
 
 #ifdef CONFIG_ACPI_HOTPLUG_MEMORY
 
-/* Memory Device States */
-#define MEMORY_INVALID_STATE	0
-#define MEMORY_POWER_ON_STATE	1
-#define MEMORY_POWER_OFF_STATE	2
-
 static int acpi_memory_device_add(struct acpi_device *device,
 				  const struct acpi_device_id *not_used);
 static void acpi_memory_device_remove(struct acpi_device *device);
@@ -64,8 +59,7 @@ struct acpi_memory_info {
 };
 
 struct acpi_memory_device {
-	struct acpi_device * device;
-	unsigned int state;	/* State of the memory device */
+	struct acpi_device *device;
 	struct list_head res_list;
 };
 
@@ -233,7 +227,6 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
 	}
 	if (!num_enabled) {
 		dev_err(&mem_device->device->dev, "add_memory failed\n");
-		mem_device->state = MEMORY_INVALID_STATE;
 		return -EINVAL;
 	}
 	/*
@@ -304,9 +297,6 @@ static int acpi_memory_device_add(struct acpi_device *device,
 		return result;
 	}
 
-	/* Set the device state */
-	mem_device->state = MEMORY_POWER_ON_STATE;
-
 	result = acpi_memory_check_device(mem_device);
 	if (result) {
 		acpi_memory_device_free(mem_device);