1 files changed, 30 insertions, 3 deletions

diff --git a/drivers/scsi/qla2xxx/qla_gs.c b/drivers/scsi/qla2xxx/qla_gs.c
index 10192f947658..caa9a3cd2580 100644
--- a/drivers/scsi/qla2xxx/qla_gs.c
+++ b/drivers/scsi/qla2xxx/qla_gs.c
@@ -3168,6 +3168,29 @@ static int qla2x00_is_a_vp(scsi_qla_host_t *vha, u64 wwn)
 	return rc;
 }
 
+static bool qla_ok_to_clear_rscn(scsi_qla_host_t *vha, fc_port_t *fcport)
+{
+	u32 rscn_gen;
+
+	rscn_gen = atomic_read(&vha->rscn_gen);
+	ql_dbg(ql_dbg_disc + ql_dbg_verbose, vha, 0x2017,
+	    "%s %d %8phC rscn_gen %x start %x end %x current %x\n",
+	    __func__, __LINE__, fcport->port_name, fcport->rscn_gen,
+	    vha->scan.rscn_gen_start, vha->scan.rscn_gen_end, rscn_gen);
+
+	if (val_is_in_range(fcport->rscn_gen, vha->scan.rscn_gen_start,
+	    vha->scan.rscn_gen_end))
+		/* rscn came in before fabric scan */
+		return true;
+
+	if (val_is_in_range(fcport->rscn_gen, vha->scan.rscn_gen_end, rscn_gen))
+		/* rscn came in after fabric scan */
+		return false;
+
+	/* rare: fcport's scan_needed + rscn_gen must be stale */
+	return true;
+}
+
 void qla24xx_async_gnnft_done(scsi_qla_host_t *vha, srb_t *sp)
 {
 	fc_port_t *fcport;
@@ -3281,10 +3304,10 @@ void qla24xx_async_gnnft_done(scsi_qla_host_t *vha, srb_t *sp)
 				   (fcport->scan_needed &&
 				    fcport->port_type != FCT_INITIATOR &&
 				    fcport->port_type != FCT_NVME_INITIATOR)) {
+				fcport->scan_needed = 0;
 				qlt_schedule_sess_for_deletion(fcport);
 			}
 			fcport->d_id.b24 = rp->id.b24;
-			fcport->scan_needed = 0;
 			break;
 		}
 
@@ -3325,7 +3348,9 @@ login_logout:
 				do_delete = true;
 			}
 
-			fcport->scan_needed = 0;
+			if (qla_ok_to_clear_rscn(vha, fcport))
+				fcport->scan_needed = 0;
+
 			if (((qla_dual_mode_enabled(vha) ||
 			      qla_ini_mode_enabled(vha)) &&
 			    atomic_read(&fcport->state) == FCS_ONLINE) ||
@@ -3355,7 +3380,9 @@ login_logout:
 					    fcport->port_name, fcport->loop_id,
 					    fcport->login_retry);
 				}
-				fcport->scan_needed = 0;
+
+				if (qla_ok_to_clear_rscn(vha, fcport))
+					fcport->scan_needed = 0;
 				qla24xx_fcport_handle_login(vha, fcport);
 			}
 		}