1 files changed, 201 insertions, 322 deletions

diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c
index 6fabf66972b9..c48799e9dd8e 100644
--- a/drivers/scsi/libfc/fc_disc.c
+++ b/drivers/scsi/libfc/fc_disc.c
@@ -43,47 +43,14 @@
 #define FC_DISC_RETRY_LIMIT	3	/* max retries */
 #define FC_DISC_RETRY_DELAY	500UL	/* (msecs) delay */
 
-#define	FC_DISC_DELAY		3
-
 static void fc_disc_gpn_ft_req(struct fc_disc *);
 static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *);
-static int fc_disc_new_target(struct fc_disc *, struct fc_rport *,
-			      struct fc_rport_identifiers *);
-static void fc_disc_del_target(struct fc_disc *, struct fc_rport *);
-static void fc_disc_done(struct fc_disc *);
+static void fc_disc_done(struct fc_disc *, enum fc_disc_event);
 static void fc_disc_timeout(struct work_struct *);
-static void fc_disc_single(struct fc_disc *, struct fc_disc_port *);
+static int fc_disc_single(struct fc_lport *, struct fc_disc_port *);
 static void fc_disc_restart(struct fc_disc *);
 
 /**
- * fc_disc_lookup_rport() - lookup a remote port by port_id
- * @lport: Fibre Channel host port instance
- * @port_id: remote port port_id to match
- */
-struct fc_rport *fc_disc_lookup_rport(const struct fc_lport *lport,
-				      u32 port_id)
-{
-	const struct fc_disc *disc = &lport->disc;
-	struct fc_rport *rport, *found = NULL;
-	struct fc_rport_libfc_priv *rdata;
-	int disc_found = 0;
-
-	list_for_each_entry(rdata, &disc->rports, peers) {
-		rport = PRIV_TO_RPORT(rdata);
-		if (rport->port_id == port_id) {
-			disc_found = 1;
-			found = rport;
-			break;
-		}
-	}
-
-	if (!disc_found)
-		found = NULL;
-
-	return found;
-}
-
-/**
  * fc_disc_stop_rports() - delete all the remote ports associated with the lport
  * @disc: The discovery job to stop rports on
  *
@@ -93,70 +60,17 @@ struct fc_rport *fc_disc_lookup_rport(const struct fc_lport *lport,
 void fc_disc_stop_rports(struct fc_disc *disc)
 {
 	struct fc_lport *lport;
-	struct fc_rport *rport;
-	struct fc_rport_libfc_priv *rdata, *next;
+	struct fc_rport_priv *rdata, *next;
 
 	lport = disc->lport;
 
 	mutex_lock(&disc->disc_mutex);
-	list_for_each_entry_safe(rdata, next, &disc->rports, peers) {
-		rport = PRIV_TO_RPORT(rdata);
-		list_del(&rdata->peers);
-		lport->tt.rport_logoff(rport);
-	}
-
-	list_for_each_entry_safe(rdata, next, &disc->rogue_rports, peers) {
-		rport = PRIV_TO_RPORT(rdata);
-		lport->tt.rport_logoff(rport);
-	}
-
+	list_for_each_entry_safe(rdata, next, &disc->rports, peers)
+		lport->tt.rport_logoff(rdata);
 	mutex_unlock(&disc->disc_mutex);
 }
 
 /**
- * fc_disc_rport_callback() - Event handler for rport events
- * @lport: The lport which is receiving the event
- * @rport: The rport which the event has occured on
- * @event: The event that occured
- *
- * Locking Note: The rport lock should not be held when calling
- *		 this function.
- */
-static void fc_disc_rport_callback(struct fc_lport *lport,
-				   struct fc_rport *rport,
-				   enum fc_rport_event event)
-{
-	struct fc_rport_libfc_priv *rdata = rport->dd_data;
-	struct fc_disc *disc = &lport->disc;
-
-	FC_DISC_DBG(disc, "Received a %d event for port (%6x)\n", event,
-		    rport->port_id);
-
-	switch (event) {
-	case RPORT_EV_CREATED:
-		if (disc) {
-			mutex_lock(&disc->disc_mutex);
-			list_add_tail(&rdata->peers, &disc->rports);
-			mutex_unlock(&disc->disc_mutex);
-		}
-		break;
-	case RPORT_EV_LOGO:
-	case RPORT_EV_FAILED:
-	case RPORT_EV_STOP:
-		mutex_lock(&disc->disc_mutex);
-		mutex_lock(&rdata->rp_mutex);
-		if (rdata->trans_state == FC_PORTSTATE_ROGUE)
-			list_del(&rdata->peers);
-		mutex_unlock(&rdata->rp_mutex);
-		mutex_unlock(&disc->disc_mutex);
-		break;
-	default:
-		break;
-	}
-
-}
-
-/**
  * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN)
  * @sp: Current sequence of the RSCN exchange
  * @fp: RSCN Frame
@@ -169,8 +83,6 @@ static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
 				  struct fc_disc *disc)
 {
 	struct fc_lport *lport;
-	struct fc_rport *rport;
-	struct fc_rport_libfc_priv *rdata;
 	struct fc_els_rscn *rp;
 	struct fc_els_rscn_page *pp;
 	struct fc_seq_els_data rjt_data;
@@ -224,10 +136,7 @@ static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
 				break;
 			}
 			dp->lp = lport;
-			dp->ids.port_id = ntoh24(pp->rscn_fid);
-			dp->ids.port_name = -1;
-			dp->ids.node_name = -1;
-			dp->ids.roles = FC_RPORT_ROLE_UNKNOWN;
+			dp->port_id = ntoh24(pp->rscn_fid);
 			list_add_tail(&dp->peers, &disc_ports);
 			break;
 		case ELS_ADDR_FMT_AREA:
@@ -240,6 +149,19 @@ static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
 		}
 	}
 	lport->tt.seq_els_rsp_send(sp, ELS_LS_ACC, NULL);
+
+	/*
+	 * If not doing a complete rediscovery, do GPN_ID on
+	 * the individual ports mentioned in the list.
+	 * If any of these get an error, do a full rediscovery.
+	 * In any case, go through the list and free the entries.
+	 */
+	list_for_each_entry_safe(dp, next, &disc_ports, peers) {
+		list_del(&dp->peers);
+		if (!redisc)
+			redisc = fc_disc_single(lport, dp);
+		kfree(dp);
+	}
 	if (redisc) {
 		FC_DISC_DBG(disc, "RSCN received: rediscovering\n");
 		fc_disc_restart(disc);
@@ -247,16 +169,6 @@ static void fc_disc_recv_rscn_req(struct fc_seq *sp, struct fc_frame *fp,
 		FC_DISC_DBG(disc, "RSCN received: not rediscovering. "
 			    "redisc %d state %d in_prog %d\n",
 			    redisc, lport->state, disc->pending);
-		list_for_each_entry_safe(dp, next, &disc_ports, peers) {
-			list_del(&dp->peers);
-			rport = lport->tt.rport_lookup(lport, dp->ids.port_id);
-			if (rport) {
-				rdata = rport->dd_data;
-				list_del(&rdata->peers);
-				lport->tt.rport_logoff(rport);
-			}
-			fc_disc_single(disc, dp);
-		}
 	}
 	fc_frame_free(fp);
 	return;
@@ -308,35 +220,34 @@ static void fc_disc_recv_req(struct fc_seq *sp, struct fc_frame *fp,
  */
 static void fc_disc_restart(struct fc_disc *disc)
 {
-	struct fc_rport *rport;
-	struct fc_rport_libfc_priv *rdata, *next;
-	struct fc_lport *lport = disc->lport;
+	if (!disc->disc_callback)
+		return;
 
 	FC_DISC_DBG(disc, "Restarting discovery\n");
 
-	list_for_each_entry_safe(rdata, next, &disc->rports, peers) {
-		rport = PRIV_TO_RPORT(rdata);
-		list_del(&rdata->peers);
-		lport->tt.rport_logoff(rport);
-	}
-
 	disc->requested = 1;
-	if (!disc->pending)
-		fc_disc_gpn_ft_req(disc);
+	if (disc->pending)
+		return;
+
+	/*
+	 * Advance disc_id.  This is an arbitrary non-zero number that will
+	 * match the value in the fc_rport_priv after discovery for all
+	 * freshly-discovered remote ports.  Avoid wrapping to zero.
+	 */
+	disc->disc_id = (disc->disc_id + 2) | 1;
+	disc->retry_count = 0;
+	fc_disc_gpn_ft_req(disc);
 }
 
 /**
  * fc_disc_start() - Fibre Channel Target discovery
  * @lport: FC local port
- *
- * Returns non-zero if discovery cannot be started.
+ * @disc_callback: function to be called when discovery is complete
  */
 static void fc_disc_start(void (*disc_callback)(struct fc_lport *,
 						enum fc_disc_event),
 			  struct fc_lport *lport)
 {
-	struct fc_rport *rport;
-	struct fc_rport_identifiers ids;
 	struct fc_disc *disc = &lport->disc;
 
 	/*
@@ -345,145 +256,47 @@ static void fc_disc_start(void (*disc_callback)(struct fc_lport *,
 	 * and send the GPN_FT request.
 	 */
 	mutex_lock(&disc->disc_mutex);
-
 	disc->disc_callback = disc_callback;
-
-	/*
-	 * If not ready, or already running discovery, just set request flag.
-	 */
-	disc->requested = 1;
-
-	if (disc->pending) {
-		mutex_unlock(&disc->disc_mutex);
-		return;
-	}
-
-	/*
-	 * Handle point-to-point mode as a simple discovery
-	 * of the remote port. Yucky, yucky, yuck, yuck!
-	 */
-	rport = disc->lport->ptp_rp;
-	if (rport) {
-		ids.port_id = rport->port_id;
-		ids.port_name = rport->port_name;
-		ids.node_name = rport->node_name;
-		ids.roles = FC_RPORT_ROLE_UNKNOWN;
-		get_device(&rport->dev);
-
-		if (!fc_disc_new_target(disc, rport, &ids)) {
-			disc->event = DISC_EV_SUCCESS;
-			fc_disc_done(disc);
-		}
-		put_device(&rport->dev);
-	} else {
-		fc_disc_gpn_ft_req(disc);	/* get ports by FC-4 type */
-	}
-
+	fc_disc_restart(disc);
 	mutex_unlock(&disc->disc_mutex);
 }
 
-static struct fc_rport_operations fc_disc_rport_ops = {
-	.event_callback = fc_disc_rport_callback,
-};
-
-/**
- * fc_disc_new_target() - Handle new target found by discovery
- * @lport: FC local port
- * @rport: The previous FC remote port (NULL if new remote port)
- * @ids: Identifiers for the new FC remote port
- *
- * Locking Note: This function expects that the disc_mutex is locked
- *		 before it is called.
- */
-static int fc_disc_new_target(struct fc_disc *disc,
-			      struct fc_rport *rport,
-			      struct fc_rport_identifiers *ids)
-{
-	struct fc_lport *lport = disc->lport;
-	struct fc_rport_libfc_priv *rdata;
-	int error = 0;
-
-	if (rport && ids->port_name) {
-		if (rport->port_name == -1) {
-			/*
-			 * Set WWN and fall through to notify of create.
-			 */
-			fc_rport_set_name(rport, ids->port_name,
-					  rport->node_name);
-		} else if (rport->port_name != ids->port_name) {
-			/*
-			 * This is a new port with the same FCID as
-			 * a previously-discovered port.  Presumably the old
-			 * port logged out and a new port logged in and was
-			 * assigned the same FCID.  This should be rare.
-			 * Delete the old one and fall thru to re-create.
-			 */
-			fc_disc_del_target(disc, rport);
-			rport = NULL;
-		}
-	}
-	if (((ids->port_name != -1) || (ids->port_id != -1)) &&
-	    ids->port_id != fc_host_port_id(lport->host) &&
-	    ids->port_name != lport->wwpn) {
-		if (!rport) {
-			rport = lport->tt.rport_lookup(lport, ids->port_id);
-			if (!rport) {
-				struct fc_disc_port dp;
-				dp.lp = lport;
-				dp.ids.port_id = ids->port_id;
-				dp.ids.port_name = ids->port_name;
-				dp.ids.node_name = ids->node_name;
-				dp.ids.roles = ids->roles;
-				rport = lport->tt.rport_create(&dp);
-			}
-			if (!rport)
-				error = -ENOMEM;
-		}
-		if (rport) {
-			rdata = rport->dd_data;
-			rdata->ops = &fc_disc_rport_ops;
-			rdata->rp_state = RPORT_ST_INIT;
-			list_add_tail(&rdata->peers, &disc->rogue_rports);
-			lport->tt.rport_login(rport);
-		}
-	}
-	return error;
-}
-
-/**
- * fc_disc_del_target() - Delete a target
- * @disc: FC discovery context
- * @rport: The remote port to be removed
- */
-static void fc_disc_del_target(struct fc_disc *disc, struct fc_rport *rport)
-{
-	struct fc_lport *lport = disc->lport;
-	struct fc_rport_libfc_priv *rdata = rport->dd_data;
-	list_del(&rdata->peers);
-	lport->tt.rport_logoff(rport);
-}
-
 /**
  * fc_disc_done() - Discovery has been completed
  * @disc: FC discovery context
+ * @event: discovery completion status
+ *
  * Locking Note: This function expects that the disc mutex is locked before
  * it is called. The discovery callback is then made with the lock released,
  * and the lock is re-taken before returning from this function
  */
-static void fc_disc_done(struct fc_disc *disc)
+static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event)
 {
 	struct fc_lport *lport = disc->lport;
-	enum fc_disc_event event;
+	struct fc_rport_priv *rdata;
 
 	FC_DISC_DBG(disc, "Discovery complete\n");
 
-	event = disc->event;
-	disc->event = DISC_EV_NONE;
+	disc->pending = 0;
+	if (disc->requested) {
+		fc_disc_restart(disc);
+		return;
+	}
 
-	if (disc->requested)
-		fc_disc_gpn_ft_req(disc);
-	else
-		disc->pending = 0;
+	/*
+	 * Go through all remote ports.  If they were found in the latest
+	 * discovery, reverify or log them in.  Otherwise, log them out.
+	 * Skip ports which were never discovered.  These are the dNS port
+	 * and ports which were created by PLOGI.
+	 */
+	list_for_each_entry(rdata, &disc->rports, peers) {
+		if (!rdata->disc_id)
+			continue;
+		if (rdata->disc_id == disc->disc_id)
+			lport->tt.rport_login(rdata);
+		else
+			lport->tt.rport_logoff(rdata);
+	}
 
 	mutex_unlock(&disc->disc_mutex);
 	disc->disc_callback(lport, event);
@@ -522,11 +335,8 @@ static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp)
 			}
 			disc->retry_count++;
 			schedule_delayed_work(&disc->disc_work, delay);
-		} else {
-			/* exceeded retries */
-			disc->event = DISC_EV_FAILED;
-			fc_disc_done(disc);
-		}
+		} else
+			fc_disc_done(disc, DISC_EV_FAILED);
 	}
 }
 
@@ -555,7 +365,7 @@ static void fc_disc_gpn_ft_req(struct fc_disc *disc)
 	if (!fp)
 		goto err;
 
-	if (lport->tt.elsct_send(lport, NULL, fp,
+	if (lport->tt.elsct_send(lport, 0, fp,
 				 FC_NS_GPN_FT,
 				 fc_disc_gpn_ft_resp,
 				 disc, lport->e_d_tov))
@@ -565,10 +375,12 @@ err:
 }
 
 /**
- * fc_disc_gpn_ft_parse() - Parse the list of IDs and names resulting from a request
+ * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response.
  * @lport: Fibre Channel host port instance
  * @buf: GPN_FT response buffer
  * @len: size of response buffer
+ *
+ * Goes through the list of IDs and names resulting from a request.
  */
 static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
 {
@@ -578,11 +390,11 @@ static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
 	size_t plen;
 	size_t tlen;
 	int error = 0;
-	struct fc_disc_port dp;
-	struct fc_rport *rport;
-	struct fc_rport_libfc_priv *rdata;
+	struct fc_rport_identifiers ids;
+	struct fc_rport_priv *rdata;
 
 	lport = disc->lport;
+	disc->seq_count++;
 
 	/*
 	 * Handle partial name record left over from previous call.
@@ -591,6 +403,7 @@ static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
 	plen = len;
 	np = (struct fc_gpn_ft_resp *)bp;
 	tlen = disc->buf_len;
+	disc->buf_len = 0;
 	if (tlen) {
 		WARN_ON(tlen >= sizeof(*np));
 		plen = sizeof(*np) - tlen;
@@ -621,31 +434,25 @@ static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
 	 * After the first time through the loop, things return to "normal".
 	 */
 	while (plen >= sizeof(*np)) {
-		dp.lp = lport;
-		dp.ids.port_id = ntoh24(np->fp_fid);
-		dp.ids.port_name = ntohll(np->fp_wwpn);
-		dp.ids.node_name = -1;
-		dp.ids.roles = FC_RPORT_ROLE_UNKNOWN;
-
-		if ((dp.ids.port_id != fc_host_port_id(lport->host)) &&
-		    (dp.ids.port_name != lport->wwpn)) {
-			rport = lport->tt.rport_create(&dp);
-			if (rport) {
-				rdata = rport->dd_data;
-				rdata->ops = &fc_disc_rport_ops;
-				rdata->local_port = lport;
-				list_add_tail(&rdata->peers,
-					      &disc->rogue_rports);
-				lport->tt.rport_login(rport);
-			} else
+		ids.port_id = ntoh24(np->fp_fid);
+		ids.port_name = ntohll(np->fp_wwpn);
+
+		if (ids.port_id != fc_host_port_id(lport->host) &&
+		    ids.port_name != lport->wwpn) {
+			rdata = lport->tt.rport_create(lport, ids.port_id);
+			if (rdata) {
+				rdata->ids.port_name = ids.port_name;
+				rdata->disc_id = disc->disc_id;
+			} else {
 				printk(KERN_WARNING "libfc: Failed to allocate "
 				       "memory for the newly discovered port "
-				       "(%6x)\n", dp.ids.port_id);
+				       "(%6x)\n", ids.port_id);
+				error = -ENOMEM;
+			}
 		}
 
 		if (np->fp_flags & FC_NS_FID_LAST) {
-			disc->event = DISC_EV_SUCCESS;
-			fc_disc_done(disc);
+			fc_disc_done(disc, DISC_EV_SUCCESS);
 			len = 0;
 			break;
 		}
@@ -665,8 +472,6 @@ static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len)
 			memcpy(&disc->partial_buf, np, len);
 		}
 		disc->buf_len = (unsigned char) len;
-	} else {
-		disc->buf_len = 0;
 	}
 	return error;
 }
@@ -683,8 +488,7 @@ static void fc_disc_timeout(struct work_struct *work)
 					    struct fc_disc,
 					    disc_work.work);
 	mutex_lock(&disc->disc_mutex);
-	if (disc->requested && !disc->pending)
-		fc_disc_gpn_ft_req(disc);
+	fc_disc_gpn_ft_req(disc);
 	mutex_unlock(&disc->disc_mutex);
 }
 
@@ -703,10 +507,10 @@ static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp,
 	struct fc_disc *disc = disc_arg;
 	struct fc_ct_hdr *cp;
 	struct fc_frame_header *fh;
+	enum fc_disc_event event = DISC_EV_NONE;
 	unsigned int seq_cnt;
-	void *buf = NULL;
 	unsigned int len;
-	int error;
+	int error = 0;
 
 	mutex_lock(&disc->disc_mutex);
 	FC_DISC_DBG(disc, "Received a GPN_FT response\n");
@@ -721,77 +525,158 @@ static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp,
 	fh = fc_frame_header_get(fp);
 	len = fr_len(fp) - sizeof(*fh);
 	seq_cnt = ntohs(fh->fh_seq_cnt);
-	if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 &&
-	    disc->seq_count == 0) {
+	if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) {
 		cp = fc_frame_payload_get(fp, sizeof(*cp));
 		if (!cp) {
 			FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n",
 				    fr_len(fp));
+			event = DISC_EV_FAILED;
 		} else if (ntohs(cp->ct_cmd) == FC_FS_ACC) {
 
 			/* Accepted, parse the response. */
-			buf = cp + 1;
 			len -= sizeof(*cp);
+			error = fc_disc_gpn_ft_parse(disc, cp + 1, len);
 		} else if (ntohs(cp->ct_cmd) == FC_FS_RJT) {
 			FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x "
 				    "(check zoning)\n", cp->ct_reason,
 				    cp->ct_explan);
-			disc->event = DISC_EV_FAILED;
-			fc_disc_done(disc);
+			event = DISC_EV_FAILED;
+			if (cp->ct_reason == FC_FS_RJT_UNABL &&
+			    cp->ct_explan == FC_FS_EXP_FTNR)
+				event = DISC_EV_SUCCESS;
 		} else {
 			FC_DISC_DBG(disc, "GPN_FT unexpected response code "
 				    "%x\n", ntohs(cp->ct_cmd));
+			event = DISC_EV_FAILED;
 		}
-	} else if (fr_sof(fp) == FC_SOF_N3 &&
-		   seq_cnt == disc->seq_count) {
-		buf = fh + 1;
+	} else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) {
+		error = fc_disc_gpn_ft_parse(disc, fh + 1, len);
 	} else {
 		FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? "
 			    "seq_cnt %x expected %x sof %x eof %x\n",
 			    seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp));
+		event = DISC_EV_FAILED;
 	}
-	if (buf) {
-		error = fc_disc_gpn_ft_parse(disc, buf, len);
-		if (error)
-			fc_disc_error(disc, fp);
-		else
-			disc->seq_count++;
-	}
+	if (error)
+		fc_disc_error(disc, fp);
+	else if (event != DISC_EV_NONE)
+		fc_disc_done(disc, event);
 	fc_frame_free(fp);
-
 	mutex_unlock(&disc->disc_mutex);
 }
 
 /**
- * fc_disc_single() - Discover the directory information for a single target
- * @lport: FC local port
- * @dp: The port to rediscover
+ * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID)
+ * @sp: exchange sequence
+ * @fp: response frame
+ * @rdata_arg: remote port private data
  *
- * Locking Note: This function expects that the disc_mutex is locked
- *		 before it is called.
+ * Locking Note: This function is called without disc mutex held.
  */
-static void fc_disc_single(struct fc_disc *disc, struct fc_disc_port *dp)
+static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp,
+				void *rdata_arg)
 {
+	struct fc_rport_priv *rdata = rdata_arg;
+	struct fc_rport_priv *new_rdata;
 	struct fc_lport *lport;
-	struct fc_rport *new_rport;
-	struct fc_rport_libfc_priv *rdata;
+	struct fc_disc *disc;
+	struct fc_ct_hdr *cp;
+	struct fc_ns_gid_pn *pn;
+	u64 port_name;
 
-	lport = disc->lport;
+	lport = rdata->local_port;
+	disc = &lport->disc;
 
-	if (dp->ids.port_id == fc_host_port_id(lport->host))
+	mutex_lock(&disc->disc_mutex);
+	if (PTR_ERR(fp) == -FC_EX_CLOSED)
 		goto out;
-
-	new_rport = lport->tt.rport_create(dp);
-	if (new_rport) {
-		rdata = new_rport->dd_data;
-		rdata->ops = &fc_disc_rport_ops;
-		kfree(dp);
-		list_add_tail(&rdata->peers, &disc->rogue_rports);
-		lport->tt.rport_login(new_rport);
+	if (IS_ERR(fp))
+		goto redisc;
+
+	cp = fc_frame_payload_get(fp, sizeof(*cp));
+	if (!cp)
+		goto redisc;
+	if (ntohs(cp->ct_cmd) == FC_FS_ACC) {
+		if (fr_len(fp) < sizeof(struct fc_frame_header) +
+		    sizeof(*cp) + sizeof(*pn))
+			goto redisc;
+		pn = (struct fc_ns_gid_pn *)(cp + 1);
+		port_name = get_unaligned_be64(&pn->fn_wwpn);
+		if (rdata->ids.port_name == -1)
+			rdata->ids.port_name = port_name;
+		else if (rdata->ids.port_name != port_name) {
+			FC_DISC_DBG(disc, "GPN_ID accepted.  WWPN changed. "
+				    "Port-id %x wwpn %llx\n",
+				    rdata->ids.port_id, port_name);
+			lport->tt.rport_logoff(rdata);
+
+			new_rdata = lport->tt.rport_create(lport,
+							   rdata->ids.port_id);
+			if (new_rdata) {
+				new_rdata->disc_id = disc->disc_id;
+				lport->tt.rport_login(new_rdata);
+			}
+			goto out;
+		}
+		rdata->disc_id = disc->disc_id;
+		lport->tt.rport_login(rdata);
+	} else if (ntohs(cp->ct_cmd) == FC_FS_RJT) {
+		FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n",
+			    cp->ct_reason, cp->ct_explan);
+		lport->tt.rport_logoff(rdata);
+	} else {
+		FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n",
+			    ntohs(cp->ct_cmd));
+redisc:
+		fc_disc_restart(disc);
 	}
-	return;
 out:
-	kfree(dp);
+	mutex_unlock(&disc->disc_mutex);
+	kref_put(&rdata->kref, lport->tt.rport_destroy);
+}
+
+/**
+ * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request
+ * @lport: local port
+ * @rdata: remote port private data
+ *
+ * Locking Note: This function expects that the disc_mutex is locked
+ *		 before it is called.
+ * On failure, an error code is returned.
+ */
+static int fc_disc_gpn_id_req(struct fc_lport *lport,
+			      struct fc_rport_priv *rdata)
+{
+	struct fc_frame *fp;
+
+	fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) +
+			    sizeof(struct fc_ns_fid));
+	if (!fp)
+		return -ENOMEM;
+	if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID,
+				 fc_disc_gpn_id_resp, rdata, lport->e_d_tov))
+		return -ENOMEM;
+	kref_get(&rdata->kref);
+	return 0;
+}
+
+/**
+ * fc_disc_single() - Discover the directory information for a single target
+ * @lport: local port
+ * @dp: The port to rediscover
+ *
+ * Locking Note: This function expects that the disc_mutex is locked
+ *		 before it is called.
+ */
+static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp)
+{
+	struct fc_rport_priv *rdata;
+
+	rdata = lport->tt.rport_create(lport, dp->port_id);
+	if (!rdata)
+		return -ENOMEM;
+	rdata->disc_id = 0;
+	return fc_disc_gpn_id_req(lport, rdata);
 }
 
 /**
@@ -841,18 +726,12 @@ int fc_disc_init(struct fc_lport *lport)
 	if (!lport->tt.disc_recv_req)
 		lport->tt.disc_recv_req = fc_disc_recv_req;
 
-	if (!lport->tt.rport_lookup)
-		lport->tt.rport_lookup = fc_disc_lookup_rport;
-
 	disc = &lport->disc;
 	INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout);
 	mutex_init(&disc->disc_mutex);
 	INIT_LIST_HEAD(&disc->rports);
-	INIT_LIST_HEAD(&disc->rogue_rports);
 
 	disc->lport = lport;
-	disc->delay = FC_DISC_DELAY;
-	disc->event = DISC_EV_NONE;
 
 	return 0;
 }