block: remove the initialize_rq_fn blk_mq_ops method

Entirely unused now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20211021060607.264371-7-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-core.c

@@ -606,16 +606,9 @@ EXPORT_SYMBOL(blk_get_queue);
 struct request *blk_get_request(struct request_queue *q, unsigned int op,
 				blk_mq_req_flags_t flags)
 {
-	struct request *req;
-
 	WARN_ON_ONCE(op & REQ_NOWAIT);
 	WARN_ON_ONCE(flags & ~(BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_PM));
-
-	req = blk_mq_alloc_request(q, op, flags);
-	if (!IS_ERR(req) && q->mq_ops->initialize_rq_fn)
-		q->mq_ops->initialize_rq_fn(req);
-
-	return req;
+	return blk_mq_alloc_request(q, op, flags);
 }
 EXPORT_SYMBOL(blk_get_request);
 

include/linux/blk-mq.h

@@ -566,11 +566,6 @@ struct blk_mq_ops {
 	void (*exit_request)(struct blk_mq_tag_set *set, struct request *,
 			     unsigned int);
 
-	/**
-	 * @initialize_rq_fn: Called from inside blk_get_request().
-	 */
-	void (*initialize_rq_fn)(struct request *rq);
-
 	/**
 	 * @cleanup_rq: Called before freeing one request which isn't completed
 	 * yet, and usually for freeing the driver private data.