diff --git a/block/genhd.c b/block/genhd.c
index 3c9dede4e04f9a1f3f6c446affc68c8694b01db1..0ad879655f825789934609f45cb7d1e9840bcc78 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -856,6 +856,7 @@ static void disk_seqf_stop(struct seq_file *seqf, void *v)
 	if (iter) {
 		class_dev_iter_exit(iter);
 		kfree(iter);
+		seqf->private = NULL;
 	}
 }