--- zzzz-none-000/linux-2.6.39.4/block/blk-core.c	2011-08-03 19:43:28.000000000 +0000
+++ puma6-atom-6490-729/linux-2.6.39.4/block/blk-core.c	2021-11-10 13:38:14.000000000 +0000
@@ -841,6 +841,11 @@
 {
 	struct request *rq;
 
+	/*== 20161123 AVM/WKR don't access dead queues ==*/
+	if (unlikely(test_bit(QUEUE_FLAG_DEAD, &q->queue_flags))) {
+		return NULL;
+	}
+
 	BUG_ON(rw != READ && rw != WRITE);
 
 	spin_lock_irq(q->queue_lock);
@@ -1067,7 +1072,14 @@
 void blk_put_request(struct request *req)
 {
 	unsigned long flags;
-	struct request_queue *q = req->q;
+	struct request_queue *q;
+
+	/*== 20161124 AVM/WKR don't access empty req ==*/
+	if (unlikely(!req)) {
+		return;
+	}
+
+	q = req->q;
 
 	spin_lock_irqsave(q->queue_lock, flags);
 	__blk_put_request(q, req);
@@ -1141,7 +1153,7 @@
 				    struct request *req, struct bio *bio)
 {
 	const int ff = bio->bi_rw & REQ_FAILFAST_MASK;
-	sector_t sector;
+/*--- 	sector_t sector; ---*/
 
 	/*
 	 * Debug stuff, kill later
@@ -1159,7 +1171,7 @@
 	if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
 		blk_rq_set_mixed_merge(req);
 
-	sector = bio->bi_sector;
+/*--- 	sector = bio->bi_sector; ---*/
 
 	bio->bi_next = req->bio;
 	req->bio = bio;