ibmvfc: Fix endless PRLI loop in discovery

Fixes a problem seen where sending a PRLI to a target
resulted in it sending a LOGO. This caused the ibmvfc
driver to go back through discovery again, which caused
another PRLI attempt, which caused another LOGO. Fix this
behavior by ignoring LOGO if we haven't even logged into
the target yet.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

drivers/scsi/ibmvscsi/ibmvfc.c

@@ -2254,10 +2254,13 @@ static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
 				continue;
 			if (crq->node_name && tgt->ids.node_name != crq->node_name)
 				continue;
-			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+			if (tgt->need_login && crq->event == IBMVFC_AE_ELS_LOGO)
+				tgt->logo_rcvd = 1;
+			if (!tgt->need_login || crq->event == IBMVFC_AE_ELS_PLOGI) {
+				ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
+				ibmvfc_reinit_host(vhost);
+			}
 		}
-
-		ibmvfc_reinit_host(vhost);
 		break;
 	case IBMVFC_AE_LINK_DOWN:
 	case IBMVFC_AE_ADAPTER_FAILED:
@@ -2927,7 +2930,11 @@ static void ibmvfc_tgt_prli_done(struct ibmvfc_event *evt)
 		break;
 	case IBMVFC_MAD_FAILED:
 	default:
-		if (ibmvfc_retry_cmd(rsp->status, rsp->error))
+		if ((rsp->status & IBMVFC_VIOS_FAILURE) && rsp->error == IBMVFC_PLOGI_REQUIRED)
+			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
+		else if (tgt->logo_rcvd)
+			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_plogi);
+		else if (ibmvfc_retry_cmd(rsp->status, rsp->error))
 			level += ibmvfc_retry_tgt_init(tgt, ibmvfc_tgt_send_prli);
 		else
 			ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_DEL_RPORT);
@@ -3054,6 +3061,7 @@ static void ibmvfc_tgt_send_plogi(struct ibmvfc_target *tgt)
 		return;
 
 	kref_get(&tgt->kref);
+	tgt->logo_rcvd = 0;
 	evt = ibmvfc_get_event(vhost);
 	vhost->discovery_threads++;
 	ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);

drivers/scsi/ibmvscsi/ibmvfc.h

@@ -605,6 +605,7 @@ struct ibmvfc_target {
 	int need_login;
 	int add_rport;
 	int init_retries;
+	int logo_rcvd;
 	u32 cancel_key;
 	struct ibmvfc_service_parms service_parms;
 	struct ibmvfc_service_parms service_parms_change;