scsi: scsi_debug: Use scsi_cmd_to_rq() instead of scsi_cmnd.request

Prepare for removal of the request pointer by using scsi_cmd_to_rq()
instead. This patch does not change any functionality.

Link: https://lore.kernel.org/r/20210809230355.8186-42-bvanassche@acm.orgAcked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/scsi_debug.c

@@ -4722,7 +4722,7 @@ static int resp_rwp_zone(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
 static struct sdebug_queue *get_queue(struct scsi_cmnd *cmnd)
 {
 	u16 hwq;
-	u32 tag = blk_mq_unique_tag(cmnd->request);
+	u32 tag = blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
 
 	hwq = blk_mq_unique_tag_to_hwq(tag);
 
@@ -4735,7 +4735,7 @@ static struct sdebug_queue *get_queue(struct scsi_cmnd *cmnd)
 
 static u32 get_tag(struct scsi_cmnd *cmnd)
 {
-	return blk_mq_unique_tag(cmnd->request);
+	return blk_mq_unique_tag(scsi_cmd_to_rq(cmnd));
 }
 
 /* Queued (deferred) command completions converge here. */
@@ -5384,7 +5384,7 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
 {
 	bool new_sd_dp;
 	bool inject = false;
-	bool hipri = (cmnd->request->cmd_flags & REQ_HIPRI);
+	bool hipri = scsi_cmd_to_rq(cmnd)->cmd_flags & REQ_HIPRI;
 	int k, num_in_q, qdepth;
 	unsigned long iflags;
 	u64 ns_from_boot = 0;
@@ -5587,8 +5587,9 @@ static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
 		if (sdebug_statistics)
 			sd_dp->issuing_cpu = raw_smp_processor_id();
 		if (unlikely(sd_dp->aborted)) {
-			sdev_printk(KERN_INFO, sdp, "abort request tag %d\n", cmnd->request->tag);
-			blk_abort_request(cmnd->request);
+			sdev_printk(KERN_INFO, sdp, "abort request tag %d\n",
+				    scsi_cmd_to_rq(cmnd)->tag);
+			blk_abort_request(scsi_cmd_to_rq(cmnd));
 			atomic_set(&sdeb_inject_pending, 0);
 			sd_dp->aborted = false;
 		}
@@ -7414,7 +7415,7 @@ static int scsi_debug_queuecommand(struct Scsi_Host *shost,
 					       (u32)cmd[k]);
 		}
 		sdev_printk(KERN_INFO, sdp, "%s: tag=%#x, cmd %s\n", my_name,
-			    blk_mq_unique_tag(scp->request), b);
+			    blk_mq_unique_tag(scsi_cmd_to_rq(scp)), b);
 	}
 	if (unlikely(inject_now && (sdebug_opts & SDEBUG_OPT_HOST_BUSY)))
 		return SCSI_MLQUEUE_HOST_BUSY;