scsi: kill off the legacy IO path

This removes the legacy (non-mq) IO path for SCSI.

Cc: linux-scsi@vger.kernel.org
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 6 insertions, 23 deletions

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index ea4b0bb0c1cd..cc71136ba300 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -222,18 +222,9 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
 	if (error)
 		goto fail;
 
-	if (shost_use_blk_mq(shost)) {
-		error = scsi_mq_setup_tags(shost);
-		if (error)
-			goto fail;
-	} else {
-		shost->bqt = blk_init_tags(shost->can_queue,
-				shost->hostt->tag_alloc_policy);
-		if (!shost->bqt) {
-			error = -ENOMEM;
-			goto fail;
-		}
-	}
+	error = scsi_mq_setup_tags(shost);
+	if (error)
+		goto fail;
 
 	if (!shost->shost_gendev.parent)
 		shost->shost_gendev.parent = dev ? dev : &platform_bus;
@@ -309,8 +300,7 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
 	pm_runtime_disable(&shost->shost_gendev);
 	pm_runtime_set_suspended(&shost->shost_gendev);
 	pm_runtime_put_noidle(&shost->shost_gendev);
-	if (shost_use_blk_mq(shost))
-		scsi_mq_destroy_tags(shost);
+	scsi_mq_destroy_tags(shost);
  fail:
 	return error;
 }
@@ -344,13 +334,8 @@ static void scsi_host_dev_release(struct device *dev)
 		kfree(dev_name(&shost->shost_dev));
 	}
 
-	if (shost_use_blk_mq(shost)) {
-		if (shost->tag_set.tags)
-			scsi_mq_destroy_tags(shost);
-	} else {
-		if (shost->bqt)
-			blk_free_tags(shost->bqt);
-	}
+	if (shost->tag_set.tags)
+		scsi_mq_destroy_tags(shost);
 
 	kfree(shost->shost_data);
 
@@ -472,8 +457,6 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
 	else
 		shost->dma_boundary = 0xffffffff;
 
-	shost->use_blk_mq = scsi_use_blk_mq || shost->hostt->force_blk_mq;
-
 	device_initialize(&shost->shost_gendev);
 	dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
 	shost->shost_gendev.bus = &scsi_bus_type;