[SCSI] mpt3sas: when async scanning is enabled then while scanning, devices...

[SCSI] mpt3sas: when async scanning is enabled then while scanning, devices are removed but their transport layer entries are not removed

When Async scanning mode is enabled and device scanning is in progress,
devices should not be removed. But in actuality, devices are removed but
their transport layer entries are not removed. This causes error to add
the same device to the transport layer after host reset or diagnostic
reset.

So, in this patch, modified the code in such a way that device is not removed
when Async scanning mode is enabled and device scanning is in progress.
Signed-off-by: Sreekanth Reddy <Sreekanth.Reddy@lsi.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

drivers/scsi/mpt3sas/mpt3sas_scsih.c

@@ -675,11 +675,12 @@ _scsih_sas_device_add(struct MPT3SAS_ADAPTER *ioc,
 		 * devices while scanning is turned on due to an oops in
 		 * scsi_sysfs_add_sdev()->add_device()->sysfs_addrm_start()
 		 */
-		if (!ioc->is_driver_loading)
+		if (!ioc->is_driver_loading) {
 			mpt3sas_transport_port_remove(ioc,
 			    sas_device->sas_address,
 			    sas_device->sas_address_parent);
-		_scsih_sas_device_remove(ioc, sas_device);
+			_scsih_sas_device_remove(ioc, sas_device);
+		}
 	}
 }
 
@@ -7531,10 +7532,12 @@ _scsih_probe_boot_devices(struct MPT3SAS_ADAPTER *ioc)
 		    sas_address_parent)) {
 			_scsih_sas_device_remove(ioc, sas_device);
 		} else if (!sas_device->starget) {
-			if (!ioc->is_driver_loading)
-				mpt3sas_transport_port_remove(ioc, sas_address,
+			if (!ioc->is_driver_loading) {
+				mpt3sas_transport_port_remove(ioc,
+				    sas_address,
 				    sas_address_parent);
-			_scsih_sas_device_remove(ioc, sas_device);
+				_scsih_sas_device_remove(ioc, sas_device);
+			}
 		}
 	}
 }
@@ -7590,13 +7593,14 @@ _scsih_probe_sas(struct MPT3SAS_ADAPTER *ioc)
 			 * oops in scsi_sysfs_add_sdev()->add_device()->
 			 * sysfs_addrm_start()
 			 */
-			if (!ioc->is_driver_loading)
+			if (!ioc->is_driver_loading) {
 				mpt3sas_transport_port_remove(ioc,
 				    sas_device->sas_address,
 				    sas_device->sas_address_parent);
-			list_del(&sas_device->list);
-			kfree(sas_device);
-			continue;
+				list_del(&sas_device->list);
+				kfree(sas_device);
+				continue;
+			}
 		}
 
 		spin_lock_irqsave(&ioc->sas_device_lock, flags);