Index: if_pfsync.c
===================================================================
RCS file: /cvs/src/sys/net/if_pfsync.c,v
retrieving revision 1.295
diff -u -p -r1.295 if_pfsync.c
--- if_pfsync.c	23 Jun 2021 06:53:51 -0000	1.295
+++ if_pfsync.c	24 Jun 2021 10:02:01 -0000
@@ -2232,6 +2232,7 @@ pfsync_request_update(u_int32_t creatori
 	struct pfsync_softc *sc = pfsyncif;
 	struct pfsync_upd_req_item *item;
 	size_t nlen, sc_len;
+	int retry;
 
 	/*
 	 * this code does nothing to prevent multiple update requests for the
@@ -2247,7 +2248,7 @@ pfsync_request_update(u_int32_t creatori
 	item->ur_msg.id = id;
 	item->ur_msg.creatorid = creatorid;
 
-	do {
+	for (;;) {
 		mtx_enter(&sc->sc_upd_req_mtx);
 
 		nlen = sizeof(struct pfsync_upd_req);
@@ -2255,16 +2256,19 @@ pfsync_request_update(u_int32_t creatori
 			nlen += sizeof(struct pfsync_subheader);
 
 		sc_len = atomic_add_long_nv(&sc->sc_len, nlen);
-		if (sc_len > sc->sc_if.if_mtu) {
+		retry = (sc_len > sc->sc_if.if_mtu);
+		if (retry)
 			atomic_sub_long(&sc->sc_len, nlen);
-			mtx_leave(&sc->sc_upd_req_mtx);
-			pfsync_sendout();
-			continue;
-		}
+		else
+			TAILQ_INSERT_TAIL(&sc->sc_upd_req_list, item, ur_entry);
 
-		TAILQ_INSERT_TAIL(&sc->sc_upd_req_list, item, ur_entry);
 		mtx_leave(&sc->sc_upd_req_mtx);
-	} while (0);
+
+		if (!retry)
+			break;
+
+		pfsync_sendout();
+	}
 
 	schednetisr(NETISR_PFSYNC);
 }