scsi: qla2xxx: Fix LUN discovery if loop id is not assigned yet by firmware

This patch fixes LUN discovery when loop ID is not yet assigned by the
firmware during driver load/sg_reset operations. Driver will now search for
new loop id before retrying login.

Fixes: 48acad09 ("scsi: qla2xxx: Fix N2N link re-connect")
Cc: stable@vger.kernel.org #4.19
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/qla2xxx/qla_init.c

@@ -646,11 +646,14 @@ static void qla24xx_handle_gnl_done_event(scsi_qla_host_t *vha,
 				break;
 			case DSC_LS_PORT_UNAVAIL:
 			default:
-				if (fcport->loop_id != FC_NO_LOOP_ID)
-					qla2x00_clear_loop_id(fcport);
-
-				fcport->loop_id = loop_id;
-				fcport->fw_login_state = DSC_LS_PORT_UNAVAIL;
+				if (fcport->loop_id == FC_NO_LOOP_ID) {
+					qla2x00_find_new_loop_id(vha, fcport);
+					fcport->fw_login_state =
+					    DSC_LS_PORT_UNAVAIL;
+				}
+				ql_dbg(ql_dbg_disc, vha, 0x20e5,
+				    "%s %d %8phC\n", __func__, __LINE__,
+				    fcport->port_name);
 				qla24xx_fcport_handle_login(vha, fcport);
 				break;
 			}