--- zzzz-none-000/linux-4.1.52/block/blk-core.c	2018-05-28 02:26:45.000000000 +0000
+++ bcm63-7530ax-731/linux-4.1.52/block/blk-core.c	2022-03-02 11:37:12.000000000 +0000
@@ -554,7 +554,11 @@
 		q->queue_lock = &q->__queue_lock;
 	spin_unlock_irq(lock);
 
+#if defined(CONFIG_BCM_KF_MISC_BACKPORTS)
+	bdi_unregister(&q->backing_dev_info);
+#else
 	bdi_destroy(&q->backing_dev_info);
+#endif
 
 	/* @q is and will stay empty, shutdown and put */
 	blk_put_queue(q);