From: James Smart <jsmart2021@gmail.com>
Date: Wed, 14 Aug 2019 16:56:50 -0700
Subject: scsi: lpfc: Fix driver nvme rescan logging
Patch-mainline: v5.4-rc1
Git-commit: a6d10f24a04d658078582fc0a89b20f050c0ae68
References: bsc#1164777 bsc#1164780 bsc#1165211

In situations where zoning is not being used, thus NVMe initiators see
other NVMe initiators as well as NVMe targets, a link bounce on an
initiator will cause the NVMe initiators to spew "6169" State Error
messages.

The driver is not qualifying whether the remote port is a NVMe targer or
not before calling the lpfc_nvme_rescan_port(), which validates the role
and prints the message if its only an NVMe initiator.

Fix by the following:

 - Before calling lpfc_nvme_rescan_port() ensure that the node is a NVMe
   storage target or a NVMe discovery controller.

 - Clean up implementation of lpfc_nvme_rescan_port. remoteport pointer
   will always be NULL if a NVMe initiator only. But, grabbing of
   remoteport pointer should be done under lock to coincide with the
   registering of the remote port with the fc transport.

Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Daniel Wagner <dwagner@suse.de>
---
 drivers/scsi/lpfc/lpfc_els.c  |   12 ++++++++++--
 drivers/scsi/lpfc/lpfc_nvme.c |   31 +++++++++++++++++--------------
 2 files changed, 27 insertions(+), 16 deletions(-)

--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -6360,7 +6360,11 @@ lpfc_rscn_recovery_check(struct lpfc_vpo
 			continue;
 		}
 
-		if (ndlp->nlp_fc4_type & NLP_FC4_NVME)
+		/* Check to see if we need to NVME rescan this target
+		 * remoteport.
+		 */
+		if (ndlp->nlp_fc4_type & NLP_FC4_NVME &&
+		    ndlp->nlp_type & (NLP_NVME_TARGET | NLP_NVME_DISCOVERY))
 			lpfc_nvme_rescan_port(vport, ndlp);
 
 		lpfc_disc_state_machine(vport, ndlp, NULL,
@@ -6474,7 +6478,11 @@ lpfc_els_rcv_rscn(struct lpfc_vport *vpo
 				 *lp, vport->fc_flag, payload_len);
 		lpfc_els_rsp_acc(vport, ELS_CMD_ACC, cmdiocb, ndlp, NULL);
 
-		if (ndlp->nlp_fc4_type & NLP_FC4_NVME)
+		/* Check to see if we need to NVME rescan this target
+		 * remoteport.
+		 */
+		if (ndlp->nlp_fc4_type & NLP_FC4_NVME &&
+		    ndlp->nlp_type & (NLP_NVME_TARGET | NLP_NVME_DISCOVERY))
 			lpfc_nvme_rescan_port(vport, ndlp);
 		return 0;
 	}
--- a/drivers/scsi/lpfc/lpfc_nvme.c
+++ b/drivers/scsi/lpfc/lpfc_nvme.c
@@ -2426,20 +2426,23 @@ void
 lpfc_nvme_rescan_port(struct lpfc_vport *vport, struct lpfc_nodelist *ndlp)
 {
 #if (IS_ENABLED(CONFIG_NVME_FC))
-	struct lpfc_nvme_rport *rport;
-	struct nvme_fc_remote_port *remoteport;
+	struct lpfc_nvme_rport *nrport;
+	struct nvme_fc_remote_port *remoteport = NULL;
 
-	rport = ndlp->nrport;
+	spin_lock_irq(&vport->phba->hbalock);
+	nrport = lpfc_ndlp_get_nrport(ndlp);
+	if (nrport)
+		remoteport = nrport->remoteport;
+	spin_unlock_irq(&vport->phba->hbalock);
 
 	lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
 			 "6170 Rescan NPort DID x%06x type x%x "
-			 "state x%x rport %p\n",
-			 ndlp->nlp_DID, ndlp->nlp_type, ndlp->nlp_state, rport);
-	if (!rport)
-		goto input_err;
-	remoteport = rport->remoteport;
-	if (!remoteport)
-		goto input_err;
+			 "state x%x nrport x%px remoteport x%px\n",
+			 ndlp->nlp_DID, ndlp->nlp_type, ndlp->nlp_state,
+			 nrport, remoteport);
+
+	if (!nrport || !remoteport)
+		goto rescan_exit;
 
 	/* Only rescan if we are an NVME target in the MAPPED state */
 	if (remoteport->port_role & FC_PORT_ROLE_NVME_DISCOVERY &&
@@ -2452,10 +2455,10 @@ lpfc_nvme_rescan_port(struct lpfc_vport
 				 ndlp->nlp_DID, remoteport->port_state);
 	}
 	return;
-input_err:
-	lpfc_printf_vlog(vport, KERN_ERR, LOG_NVME_DISC,
-			 "6169 State error: lport %p, rport%p FCID x%06x\n",
-			 vport->localport, ndlp->rport, ndlp->nlp_DID);
+ rescan_exit:
+	lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_DISC,
+			 "6169 Skip NVME Rport Rescan, NVME remoteport "
+			 "unregistered\n");
 #endif
 }