[PATCH] mpt3sas: delay scsi_add_host call to work with scsi-mq

["Elliott, Robert (Server Storage)" <Elliott@xxxxxx>]

In _scsih_probe, delay the call to scsi_add_host until
the host template has been completely filled in.

Otherwise, the default .can_queue value of 1 causes
scsi-mq to set the block layer request queue size
to its minimum size, resulting in awful performance.

In _scsih_probe error handling, call mpt3sas_base_detach
rather than scsi_remove_host to properly clean up
in reverse order.

In _scsih_remove, call scsi_remove_host earlier
to clean up in reverse order.

Signed-off-by: Robert Elliott <elliott@xxxxxx>
---
 drivers/scsi/mpt3sas/mpt3sas_scsih.c |   20 ++++++++++----------
 1 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index 18e713d..529b5fd 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -7431,9 +7431,9 @@ static void _scsih_remove(struct pci_dev *pdev)
 	}
 
 	sas_remove_host(shost);
+	scsi_remove_host(shost);
 	mpt3sas_base_detach(ioc);
 	list_del(&ioc->list);
-	scsi_remove_host(shost);
 	scsi_host_put(shost);
 }
 
@@ -7801,13 +7801,6 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		}
 	}
 
-	if ((scsi_add_host(shost, &pdev->dev))) {
-		pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
-		    ioc->name, __FILE__, __LINE__, __func__);
-		list_del(&ioc->list);
-		goto out_add_shost_fail;
-	}
-
 	/* register EEDP capabilities with SCSI layer */
 	if (prot_mask > 0)
 		scsi_host_set_prot(shost, prot_mask);
@@ -7835,15 +7828,22 @@ _scsih_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		    ioc->name, __FILE__, __LINE__, __func__);
 		goto out_attach_fail;
 	}
+
+	if ((scsi_add_host(shost, &pdev->dev))) {
+		pr_err(MPT3SAS_FMT "failure at %s:%d/%s()!\n",
+		    ioc->name, __FILE__, __LINE__, __func__);
+		goto out_add_shost_fail;
+	}
+
 	scsi_scan_host(shost);
 	return 0;
 
+ out_add_shost_fail:
+	mpt3sas_base_detach(ioc);
  out_attach_fail:
 	destroy_workqueue(ioc->firmware_event_thread);
  out_thread_fail:
 	list_del(&ioc->list);
-	scsi_remove_host(shost);
- out_add_shost_fail:
 	scsi_host_put(shost);
 	return -ENODEV;
 }

---
Rob Elliott    HP Server Storage



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