[PATCH AUTOSEL 4.19 06/39] scsi: lpfc: Fix "Unexpected timeout" error in direct attach topology

[Sasha Levin]

From: James Smart <jsmart2021@xxxxxxxxx>

[ Upstream commit e30d55137edef47434c40d7570276a0846fe922c ]

An 'unexpected timeout' message may be seen in a point-2-point topology.
The message occurs when a PLOGI is received before the driver is notified
of FLOGI completion. The FLOGI completion failure causes discovery to be
triggered for a second time. The discovery timer is restarted but no new
discovery activity is initiated, thus the timeout message eventually
appears.

In point-2-point, when discovery has progressed before the FLOGI completion
is processed, it is not a failure. Add code to FLOGI completion to detect
that discovery has progressed and exit the FLOGI handling (noop'ing it).

Link: https://lore.kernel.org/r/20210514195559.119853-4-jsmart2021@xxxxxxxxx
Co-developed-by: Justin Tee <justin.tee@xxxxxxxxxxxx>
Signed-off-by: Justin Tee <justin.tee@xxxxxxxxxxxx>
Signed-off-by: James Smart <jsmart2021@xxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/scsi/lpfc/lpfc_els.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 6a4b496081e4..c4428249d3d7 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -1176,6 +1176,15 @@ lpfc_cmpl_els_flogi(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb,
 			phba->fcf.fcf_redisc_attempted = 0; /* reset */
 			goto out;
 		}
+	} else if (vport->port_state > LPFC_FLOGI &&
+		   vport->fc_flag & FC_PT2PT) {
+		/*
+		 * In a p2p topology, it is possible that discovery has
+		 * already progressed, and this completion can be ignored.
+		 * Recheck the indicated topology.
+		 */
+		if (!sp->cmn.fPort)
+			goto out;
 	}
 
 flogifail:
-- 
2.30.2