linux-kernel - [PATCH] qla2xxx: Return EBUSY on fcport deletion

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Date:   Mon, 12 Oct 2020 11:11:00 +0200
From:   Daniel Wagner <dwagner@...e.de>
To:     Nilesh Javali <njavali@...vell.com>, Arun Easi <aeasi@...vell.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Daniel Wagner <dwagner@...e.de>
Subject: [PATCH] qla2xxx: Return EBUSY on fcport deletion

When the fcport is about to be deleted we should return EBUSY instead
of ENODEV. Only for EBUSY the request will be requeued in a multipath
setup.

Also in case we have a valid qpair but the firmware has not yet
started return EBUSY to avoid dropping the request.

Signed-off-by: Daniel Wagner <dwagner@...e.de>
---
Hi,

During port bounce and fail tests we observed that requests get
dropped on a failing path because the driver returned ENODEV and thus
the multipath code didn't requeue the request.

The tests were done with only the 'fcport && fcport->deleted' condition
but Hannes suggested we might as well do the same for 'qpair &&
!qpair->fw_started'.

Thanks,
Daniel

 drivers/scsi/qla2xxx/qla_nvme.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/qla2xxx/qla_nvme.c b/drivers/scsi/qla2xxx/qla_nvme.c
index 5cc1bbb1ed74..db8b802b147c 100644
--- a/drivers/scsi/qla2xxx/qla_nvme.c
+++ b/drivers/scsi/qla2xxx/qla_nvme.c
@@ -555,8 +555,11 @@ static int qla_nvme_post_cmd(struct nvme_fc_local_port *lport,

 	fcport = qla_rport->fcport;

-	if (!qpair || !fcport || (qpair && !qpair->fw_started) ||
+	if ((qpair && !qpair->fw_started) ||
 	    (fcport && fcport->deleted))
+		return -EBUSY;
+
+	if (!qpair || !fcport)
 		return rval;

 	vha = fcport->vha;
-- 
2.16.4