[SCSI] srp_transport: convert to use supported_mode attribute

srp transport works for target drivers without supported_mode
attribute but it would be better to use it explicitly.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/ibmvscsi/ibmvstgt.c

@@ -820,6 +820,7 @@ static struct scsi_host_template ibmvstgt_sht = {
 	.eh_abort_handler	= ibmvstgt_eh_abort_handler,
 	.shost_attrs		= ibmvstgt_attrs,
 	.proc_name		= TGT_NAME,
+	.supported_mode		= MODE_TARGET,
 };
 
 static int ibmvstgt_probe(struct vio_dev *dev, const struct vio_device_id *id)

drivers/scsi/scsi_transport_srp.c

@@ -222,7 +222,8 @@ struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
 		return ERR_PTR(ret);
 	}
 
-	if (ids->roles == SRP_RPORT_ROLE_INITIATOR) {
+	if (shost->active_mode & MODE_TARGET &&
+	    ids->roles == SRP_RPORT_ROLE_INITIATOR) {
 		ret = srp_tgt_it_nexus_create(shost, (unsigned long)rport,
 					      rport->port_id);
 		if (ret) {
@@ -249,10 +250,11 @@ EXPORT_SYMBOL_GPL(srp_rport_add);
 void srp_rport_del(struct srp_rport *rport)
 {
 	struct device *dev = &rport->dev;
+	struct Scsi_Host *shost = dev_to_shost(dev->parent);
 
-	if (rport->roles == SRP_RPORT_ROLE_INITIATOR)
-		srp_tgt_it_nexus_destroy(dev_to_shost(dev->parent),
-					 (unsigned long)rport);
+	if (shost->active_mode & MODE_TARGET &&
+	    rport->roles == SRP_RPORT_ROLE_INITIATOR)
+		srp_tgt_it_nexus_destroy(shost, (unsigned long)rport);
 
 	transport_remove_device(dev);
 	device_del(dev);