[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>
diff --git a/drivers/scsi/scsi_transport_srp.c b/drivers/scsi/scsi_transport_srp.c
index 430501e..44a340b 100644
--- a/drivers/scsi/scsi_transport_srp.c
+++ b/drivers/scsi/scsi_transport_srp.c
@@ -222,7 +222,8 @@
 		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 @@
 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);