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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Justin Tee <justin.tee@broadcom.com>,
        James Smart <jsmart2021@gmail.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 020/149] scsi: lpfc: Fix "Unexpected timeout" error in direct attach topology
Date:   Mon, 19 Jul 2021 16:52:08 +0200
Message-Id: <20210719144906.253245006@linuxfoundation.org>
In-Reply-To: <20210719144901.370365147@linuxfoundation.org>
References: <20210719144901.370365147@linuxfoundation.org>
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From: James Smart <jsmart2021@gmail.com>

[ 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@gmail.com
Co-developed-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: Justin Tee <justin.tee@broadcom.com>
Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 4e994a693e3f..2040affa0887 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -1179,6 +1179,15 @@ stop_rr_fcf_flogi:
 			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