scsi: qla2xxx: Fix I/O errors during LIP reset tests

In .fcp_io(), returning ENODEV as soon as remote port delete has started
can cause I/O errors. Fix this by returning EBUSY until the remote port
delete finishes.

Link: https://lore.kernel.org/r/20200904045128.23631-9-njavali@marvell.com
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: Nilesh Javali <njavali@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_nvme.c

@@ -548,6 +548,14 @@ static int qla_nvme_post_cmd(struct nvme_fc_local_port *lport,
 		return rval;
 
 	vha = fcport->vha;
+
+	if (!(fcport->nvme_flag & NVME_FLAG_REGISTERED))
+		return rval;
+
+	if (test_bit(ABORT_ISP_ACTIVE, &vha->dpc_flags) ||
+	    (qpair && !qpair->fw_started) || fcport->deleted)
+		return -EBUSY;
+
 	/*
 	 * If we know the dev is going away while the transport is still sending
 	 * IO's return busy back to stall the IO Q.  This happens when the