netdev - [PATCH v4 3/9] qedf: Acquire rport_lock for resetting the delay

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Message-ID: <20200416084314.18851-4-skashyap@marvell.com>
Date:   Thu, 16 Apr 2020 01:43:08 -0700
From:   Saurav Kashyap <skashyap@...vell.com>
To:     <martin.petersen@...cle.com>
CC:     <GR-QLogic-Storage-Upstream@...vell.com>,
        <linux-scsi@...r.kernel.org>, <jhasan@...vell.com>,
        <netdev@...r.kernel.org>
Subject: [PATCH v4 3/9] qedf: Acquire rport_lock for resetting the delay_timestamp

From: Javed Hasan <jhasan@...vell.com>

retry delay timestamp is updated in queuecommand as well
qedf_scsi_completion routine, protect it using lock.

Signed-off-by: Javed Hasan <jhasan@...vell.com>
Signed-off-by: Saurav Kashyap <skashyap@...vell.com>
---
 drivers/scsi/qedf/qedf_io.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/scsi/qedf/qedf_io.c b/drivers/scsi/qedf/qedf_io.c
index e749a2d..64c1769 100644
--- a/drivers/scsi/qedf/qedf_io.c
+++ b/drivers/scsi/qedf/qedf_io.c
@@ -1021,14 +1021,18 @@ int qedf_post_io_req(struct qedf_rport *fcport, struct qedf_ioreq *io_req)
 	atomic_inc(&fcport->ios_to_queue);
 
 	if (fcport->retry_delay_timestamp) {
+		/* Take fcport->rport_lock for resetting the delay_timestamp */
+		spin_lock_irqsave(&fcport->rport_lock, flags);
 		if (time_after(jiffies, fcport->retry_delay_timestamp)) {
 			fcport->retry_delay_timestamp = 0;
 		} else {
+			spin_unlock_irqrestore(&fcport->rport_lock, flags);
 			/* If retry_delay timer is active, flow off the ML */
 			rc = SCSI_MLQUEUE_TARGET_BUSY;
 			atomic_dec(&fcport->ios_to_queue);
 			goto exit_qcmd;
 		}
+		spin_unlock_irqrestore(&fcport->rport_lock, flags);
 	}
 
 	io_req = qedf_alloc_cmd(fcport, QEDF_SCSI_CMD);
-- 
1.8.3.1