diff --git a/block/blk-core.c b/block/blk-core.c
index c4c7fd4dcc2a..e185ca1b35a1 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -362,6 +362,7 @@ void blk_clear_preempt_only(struct request_queue *q)
 
 	spin_lock_irqsave(q->queue_lock, flags);
 	queue_flag_clear(QUEUE_FLAG_PREEMPT_ONLY, q);
+	wake_up_all(&q->mq_freeze_wq);
 	spin_unlock_irqrestore(q->queue_lock, flags);
 }
 EXPORT_SYMBOL(blk_clear_preempt_only);
@@ -783,13 +784,32 @@ struct request_queue *blk_alloc_queue(gfp_t gfp_mask)
 }
 EXPORT_SYMBOL(blk_alloc_queue);
 
-int blk_queue_enter(struct request_queue *q, bool nowait)
+/**
+ * blk_queue_enter() - try to increase q->q_usage_counter
+ * @q: request queue pointer
+ * @nowait: if the queue is frozen, do not wait until it is unfrozen
+ * @preempt: if QUEUE_FLAG_PREEMPT_ONLY has been set, do not wait until that
+ *	flag has been cleared
+ */
+int blk_queue_enter(struct request_queue *q, bool nowait, bool preempt)
 {
 	while (true) {
 		int ret;
 
-		if (percpu_ref_tryget_live(&q->q_usage_counter))
-			return 0;
+		if (percpu_ref_tryget_live(&q->q_usage_counter)) {
+			/*
+			 * The code that sets the PREEMPT_ONLY flag is
+			 * responsible for ensuring that that flag is globally
+			 * visible before the queue is unfrozen.
+			 */
+			if (preempt || !blk_queue_preempt_only(q)) {
+				return 0;
+			} else {
+				percpu_ref_put(&q->q_usage_counter);
+				WARN_ONCE("%s: Attempt to allocate non-preempt request in preempt-only mode.\n",
+					  kobject_name(q->kobj.parent));
+			}
+		}
 
 		if (nowait)
 			return -EBUSY;
@@ -804,7 +824,8 @@ int blk_queue_enter(struct request_queue *q, bool nowait)
 		smp_rmb();
 
 		ret = wait_event_interruptible(q->mq_freeze_wq,
-				!atomic_read(&q->mq_freeze_depth) ||
+				(atomic_read(&q->mq_freeze_depth) == 0 &&
+				 (preempt || !blk_queue_preempt_only(q))) ||
 				blk_queue_dying(q));
 		if (blk_queue_dying(q))
 			return -ENODEV;
@@ -1426,7 +1447,7 @@ static struct request *blk_old_get_request(struct request_queue *q,
 	create_io_context(gfp_mask, q->node);
 
 	ret = blk_queue_enter(q, !(gfp_mask & __GFP_DIRECT_RECLAIM) ||
-			      (op & REQ_NOWAIT));
+			      (op & REQ_NOWAIT), op & REQ_PREEMPT);
 	if (ret)
 		return ERR_PTR(ret);
 	spin_lock_irq(q->queue_lock);
@@ -2194,6 +2215,7 @@ blk_qc_t generic_make_request(struct bio *bio)
 	 */
 	struct bio_list bio_list_on_stack[2];
 	blk_qc_t ret = BLK_QC_T_NONE;
+	const bool nowait = bio->bi_opf & REQ_NOWAIT;
 
 	if (!generic_make_request_checks(bio))
 		goto out;
@@ -2233,7 +2255,7 @@ blk_qc_t generic_make_request(struct bio *bio)
 	do {
 		struct request_queue *q = bio->bi_disk->queue;
 
-		if (likely(blk_queue_enter(q, bio->bi_opf & REQ_NOWAIT) == 0)) {
+		if (likely(blk_queue_enter(q, nowait, false) == 0)) {
 			struct bio_list lower, same;
 
 			/* Create a fresh bio_list for all subordinate requests */
@@ -2258,8 +2280,7 @@ blk_qc_t generic_make_request(struct bio *bio)
 			bio_list_merge(&bio_list_on_stack[0], &same);
 			bio_list_merge(&bio_list_on_stack[0], &bio_list_on_stack[1]);
 		} else {
-			if (unlikely(!blk_queue_dying(q) &&
-					(bio->bi_opf & REQ_NOWAIT)))
+			if (unlikely(!blk_queue_dying(q) && nowait))
 				bio_wouldblock_error(bio);
 			else
 				bio_io_error(bio);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index ebf85e270509..20a5f61cb248 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -384,7 +384,7 @@ struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op,
 	struct request *rq;
 	int ret;
 
-	ret = blk_queue_enter(q, flags & BLK_MQ_REQ_NOWAIT);
+	ret = blk_queue_enter(q, flags & BLK_MQ_REQ_NOWAIT, op & REQ_PREEMPT);
 	if (ret)
 		return ERR_PTR(ret);
 
@@ -423,7 +423,7 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
 	if (hctx_idx >= q->nr_hw_queues)
 		return ERR_PTR(-EIO);
 
-	ret = blk_queue_enter(q, true);
+	ret = blk_queue_enter(q, true, op & REQ_PREEMPT);
 	if (ret)
 		return ERR_PTR(ret);
 
diff --git a/block/blk-timeout.c b/block/blk-timeout.c
index 17ec83bb0900..0dfdc975473a 100644
--- a/block/blk-timeout.c
+++ b/block/blk-timeout.c
@@ -134,7 +134,7 @@ void blk_timeout_work(struct work_struct *work)
 	struct request *rq, *tmp;
 	int next_set = 0;
 
-	if (blk_queue_enter(q, true))
+	if (blk_queue_enter(q, true, true))
 		return;
 	spin_lock_irqsave(q->queue_lock, flags);
 
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 93d088ffc05c..e9ca45087a40 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -674,7 +674,7 @@ int bdev_read_page(struct block_device *bdev, sector_t sector,
 	if (!ops->rw_page || bdev_get_integrity(bdev))
 		return result;
 
-	result = blk_queue_enter(bdev->bd_queue, false);
+	result = blk_queue_enter(bdev->bd_queue, false, false);
 	if (result)
 		return result;
 	result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, false);
@@ -710,7 +710,7 @@ int bdev_write_page(struct block_device *bdev, sector_t sector,
 
 	if (!ops->rw_page || bdev_get_integrity(bdev))
 		return -EOPNOTSUPP;
-	result = blk_queue_enter(bdev->bd_queue, false);
+	result = blk_queue_enter(bdev->bd_queue, false, false);
 	if (result)
 		return result;
 
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 50bf37dacf4c..645e9f1df8cc 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -966,7 +966,7 @@ extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
 			 struct scsi_ioctl_command __user *);
 
-extern int blk_queue_enter(struct request_queue *q, bool nowait);
+extern int blk_queue_enter(struct request_queue *q, bool nowait, bool preempt);
 extern void blk_queue_exit(struct request_queue *q);
 extern void blk_start_queue(struct request_queue *q);
 extern void blk_start_queue_async(struct request_queue *q);
