blk-mq: move queue_is_mq out of blk_mq_cancel_work_sync

The only caller that needs queue_is_mq check is del_gendisk, so move the
check into it.
Signed-off-by: Jinlong Chen <nickyc975@zju.edu.cn>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221030094730.1275463-1-nickyc975@zju.edu.cnSigned-off-by: Jens Axboe <axboe@kernel.dk>

block/blk-mq.c

@@ -4883,7 +4883,6 @@ EXPORT_SYMBOL(blk_mq_rq_cpu);
 
 void blk_mq_cancel_work_sync(struct request_queue *q)
 {
-	if (queue_is_mq(q)) {
 	struct blk_mq_hw_ctx *hctx;
 	unsigned long i;
 
@@ -4891,7 +4890,6 @@ void blk_mq_cancel_work_sync(struct request_queue *q)
 
 	queue_for_each_hw_ctx(q, hctx, i)
 		cancel_delayed_work_sync(&hctx->run_work);
-	}
 }
 
 static int __init blk_mq_init(void)

block/genhd.c

@@ -638,6 +638,8 @@ void del_gendisk(struct gendisk *disk)
 
 	blk_sync_queue(q);
 	blk_flush_integrity();
+
+	if (queue_is_mq(q))
 		blk_mq_cancel_work_sync(q);
 
 	blk_mq_quiesce_queue(q);