scsi: qedf: Acquire rport_lock for resetting the delay_timestamp

Retry delay timestamp is updated in queuecommand as well as in
qedf_scsi_completion routine. Protect it using lock.

Link: https://lore.kernel.org/r/20200416084314.18851-4-skashyap@marvell.com
Signed-off-by: Javed Hasan <jhasan@marvell.com>
Signed-off-by: Saurav Kashyap <skashyap@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qedf/qedf_io.c

@@ -1021,14 +1021,18 @@ qedf_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc_cmd)
 	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);