diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 70cbd0ee1b0768bbf6625bdd025511b545d49d5e..213bfd26438d7a092bf7d7e533e6042bb32ece81 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -312,12 +312,13 @@ static void reset_bdev(struct zram *zram)
 static ssize_t backing_dev_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
+	struct file *file;
 	struct zram *zram = dev_to_zram(dev);
-	struct file *file = zram->backing_dev;
 	char *p;
 	ssize_t ret;
 
 	down_read(&zram->init_lock);
+	file = zram->backing_dev;
 	if (!zram_wb_enabled(zram)) {
 		memcpy(buf, "none\n", 5);
 		up_read(&zram->init_lock);