[PATCH 4/9] scsi: Rework scsi_mq_alloc_queue()

[Bart Van Assche <bvanassche@xxxxxxx>]

Do not modify sdev->request_queue. Remove the sdev->request_queue
assignment. That assignment is superfluous because scsi_mq_alloc_queue()
only has one caller and that caller calls scsi_mq_alloc_queue() as follows:

	sdev->request_queue = scsi_mq_alloc_queue(sdev);

Cc: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Cc: Can Guo <cang@xxxxxxxxxxxxxx>
Cc: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
---
 drivers/scsi/scsi_lib.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 760976f27634..9e3c2930ce40 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1854,14 +1854,15 @@ static const struct blk_mq_ops scsi_mq_ops = {
 
 struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev)
 {
-	sdev->request_queue = blk_mq_init_queue(&sdev->host->tag_set);
-	if (IS_ERR(sdev->request_queue))
+	struct request_queue *q = blk_mq_init_queue(&sdev->host->tag_set);
+
+	if (IS_ERR(q))
 		return NULL;
 
-	sdev->request_queue->queuedata = sdev;
-	__scsi_init_queue(sdev->host, sdev->request_queue);
-	blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, sdev->request_queue);
-	return sdev->request_queue;
+	q->queuedata = sdev;
+	__scsi_init_queue(sdev->host, q);
+	blk_queue_flag_set(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
+	return q;
 }
 
 int scsi_mq_setup_tags(struct Scsi_Host *shost)