--- zzzz-none-000/linux-4.1.52/block/blk-sysfs.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/block/blk-sysfs.c	2022-03-02 11:37:12.000000000 +0000
@@ -501,6 +501,9 @@
 	struct request_queue *q =
 		container_of(kobj, struct request_queue, kobj);
 
+#if defined(CONFIG_BCM_KF_MISC_BACKPORTS)
+	bdi_exit(&q->backing_dev_info);
+#endif
 	blkcg_exit_queue(q);
 
 	if (q->elevator) {