scsi: fas216: Kill scmd->tag

The driver is attempting to allocate a tag internally which is a no-go with
blk-mq. Switch the driver to use the request tag and kill usage of
scmd->tag and scmd->device->current_tag.

[jpg: Change to use scsi_cmd_to_rq()]

Link: https://lore.kernel.org/r/1631696835-136198-2-git-send-email-john.garry@huawei.com
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/arm/fas216.c

@@ -77,7 +77,6 @@
  *  I was thinking that this was a good chip until I found this restriction ;(
  */
 #define SCSI2_SYNC
-#undef  SCSI2_TAG
 
 #undef DEBUG_CONNECT
 #undef DEBUG_MESSAGES
@@ -990,7 +989,7 @@ fas216_reselected_intr(FAS216_Info *info)
 		info->scsi.disconnectable = 0;
 		if (info->SCpnt->device->id  == target &&
 		    info->SCpnt->device->lun == lun &&
-		    info->SCpnt->tag         == tag) {
+		    scsi_cmd_to_rq(info->SCpnt)->tag == tag) {
 			fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
 		} else {
 			queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
@@ -1791,8 +1790,9 @@ static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
 	/*
 	 * add tag message if required
 	 */
-	if (SCpnt->tag)
-		msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, SCpnt->tag);
+	if (SCpnt->device->simple_tags)
+		msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG,
+				scsi_cmd_to_rq(SCpnt)->tag);
 
 	do {
 #ifdef SCSI2_SYNC
@@ -1815,20 +1815,8 @@ static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
 
 static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
 {
-#ifdef SCSI2_TAG
-	/*
-	 * tagged queuing - allocate a new tag to this command
-	 */
-	if (SCpnt->device->simple_tags && SCpnt->cmnd[0] != REQUEST_SENSE &&
-	    SCpnt->cmnd[0] != INQUIRY) {
-	    SCpnt->device->current_tag += 1;
-		if (SCpnt->device->current_tag == 0)
-		    SCpnt->device->current_tag = 1;
-			SCpnt->tag = SCpnt->device->current_tag;
-	} else
-#endif
-		set_bit(SCpnt->device->id * 8 +
-			(u8)(SCpnt->device->lun & 0x7), info->busyluns);
+	set_bit(SCpnt->device->id * 8 +
+		(u8)(SCpnt->device->lun & 0x7), info->busyluns);
 
 	info->stats.removes += 1;
 	switch (SCpnt->cmnd[0]) {
@@ -2117,7 +2105,6 @@ fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
 	init_SCp(SCpnt);
 	SCpnt->SCp.Message = 0;
 	SCpnt->SCp.Status = 0;
-	SCpnt->tag = 0;
 	SCpnt->host_scribble = (void *)fas216_rq_sns_done;
 
 	/*
@@ -2223,7 +2210,6 @@ static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt,
 	init_SCp(SCpnt);
 
 	info->stats.queues += 1;
-	SCpnt->tag = 0;
 
 	spin_lock(&info->host_lock);
 
@@ -3003,9 +2989,8 @@ void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
 		dev = &info->device[scd->id];
 		seq_printf(m, "     %d/%llu   ", scd->id, scd->lun);
 		if (scd->tagged_supported)
-			seq_printf(m, "%3sabled(%3d) ",
-				     scd->simple_tags ? "en" : "dis",
-				     scd->current_tag);
+			seq_printf(m, "%3sabled ",
+				     scd->simple_tags ? "en" : "dis");
 		else
 			seq_puts(m, "unsupported   ");