Revert "block: Provide blk_mq_sched_get_icq()"

This reverts commit 4896c4e64ba5d5d5acdbcf68c5910dd4f6d8fa62.

The helper is not needed any more.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20211126115817.2087431-6-hch@lst.deSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-mq-sched.c

@@ -18,8 +18,9 @@
 #include "blk-mq-tag.h"
 #include "blk-wbt.h"
 
-struct io_cq *blk_mq_sched_get_icq(struct request_queue *q)
+void blk_mq_sched_assign_ioc(struct request *rq)
 {
+	struct request_queue *q = rq->q;
 	struct io_context *ioc;
 	struct io_cq *icq;
 
@@ -27,27 +28,22 @@ struct io_cq *blk_mq_sched_get_icq(struct request_queue *q)
 	if (unlikely(!current->io_context))
 		create_task_io_context(current, GFP_ATOMIC, q->node);
 
-	/* May not have an IO context if context creation failed */
+	/*
+	 * May not have an IO context if it's a passthrough request
+	 */
 	ioc = current->io_context;
 	if (!ioc)
-		return NULL;
+		return;
 
 	spin_lock_irq(&q->queue_lock);
 	icq = ioc_lookup_icq(ioc, q);
 	spin_unlock_irq(&q->queue_lock);
-	if (icq)
-		return icq;
-	return ioc_create_icq(ioc, q, GFP_ATOMIC);
-}
-EXPORT_SYMBOL(blk_mq_sched_get_icq);
 
-void blk_mq_sched_assign_ioc(struct request *rq)
-{
-	struct io_cq *icq;
-
-	icq = blk_mq_sched_get_icq(rq->q);
-	if (!icq)
-		return;
+	if (!icq) {
+		icq = ioc_create_icq(ioc, q, GFP_ATOMIC);
+		if (!icq)
+			return;
+	}
 	get_io_context(icq->ioc);
 	rq->elv.icq = icq;
 }

block/blk-mq-sched.h

@@ -8,7 +8,6 @@
 
 #define MAX_SCHED_RQ (16 * BLKDEV_DEFAULT_RQ)
 
-struct io_cq *blk_mq_sched_get_icq(struct request_queue *q);
 void blk_mq_sched_assign_ioc(struct request *rq);
 
 bool blk_mq_sched_try_merge(struct request_queue *q, struct bio *bio,