[SCSI] qla4xxx: regression - add start scan callout

We are seeing EXIST errors from sysfs during device addition.
We need a start scan callout so we do not start scanning sessions
found during hba setup, before the async scsi scan code is ready.

Signed-off-by: Mike Christie <[e-mail]>
Acked-by: David C Somayajulu <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/qla4xxx/ql4_os.c

···
 static int qla4xxx_slave_alloc(struct scsi_device *device);
 static int qla4xxx_slave_configure(struct scsi_device *device);
 static void qla4xxx_slave_destroy(struct scsi_device *sdev);
+static void qla4xxx_scan_start(struct Scsi_Host *shost);
 
 static struct scsi_host_template qla4xxx_driver_template = {
 	.module			= THIS_MODULE,
···
 	.slave_destroy		= qla4xxx_slave_destroy,
 
 	.scan_finished		= iscsi_scan_finished,
+	.scan_start		= qla4xxx_scan_start,
 
 	.this_id		= -1,
 	.cmd_per_lun		= 3,
···
 	ddb_entry->ha = ha;
 	ddb_entry->sess = sess;
 	return ddb_entry;
+}
+
+static void qla4xxx_scan_start(struct Scsi_Host *shost)
+{
+	struct scsi_qla_host *ha = shost_priv(shost);
+	struct ddb_entry *ddb_entry, *ddbtemp;
+
+	/* finish setup of sessions that were already setup in firmware */
+	list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
+		if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
+			qla4xxx_add_sess(ddb_entry);
+	}
 }
 
 /*
···
 	int ret = -ENODEV, status;
 	struct Scsi_Host *host;
 	struct scsi_qla_host *ha;
-	struct ddb_entry *ddb_entry, *ddbtemp;
 	uint8_t init_retry_count = 0;
 	char buf[34];
 
···
 	if (ret)
 		goto probe_failed;
 
-	/* Update transport device information for all devices. */
-	list_for_each_entry_safe(ddb_entry, ddbtemp, &ha->ddb_list, list) {
-		if (ddb_entry->fw_ddb_device_state == DDB_DS_SESSION_ACTIVE)
-			if (qla4xxx_add_sess(ddb_entry))
-				goto remove_host;
-	}
-
 	printk(KERN_INFO
 	       " QLogic iSCSI HBA Driver version: %s\n"
 	       "  QLogic ISP%04x @ %s, host#=%ld, fw=%02d.%02d.%02d.%02d\n",
···
 	       ha->patch_number, ha->build_number);
 	scsi_scan_host(host);
 	return 0;
-
-remove_host:
-	qla4xxx_free_ddb_list(ha);
-	scsi_remove_host(host);
 
 probe_failed:
 	qla4xxx_free_adapter(ha);