From 9f67f65b7ee43f0ed9f444d4792678bb874a7857 Mon Sep 17 00:00:00 2001
From: dlg <dlg@openbsd.org>
Date: Wed, 2 Jun 2021 01:37:10 +0000
Subject: [PATCH] only read the if_bpf pointer once.

---
 sys/net/if_tpmr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sys/net/if_tpmr.c b/sys/net/if_tpmr.c
index 50ac1ed91b4..f6eb99f347c 100644
--- a/sys/net/if_tpmr.c
+++ b/sys/net/if_tpmr.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: if_tpmr.c,v 1.29 2021/06/02 01:36:10 dlg Exp $ */
+/*	$OpenBSD: if_tpmr.c,v 1.30 2021/06/02 01:37:10 dlg Exp $ */
 
 /*
  * Copyright (c) 2019 The University of Queensland
@@ -368,7 +368,7 @@ tpmr_input(struct ifnet *ifp0, struct mbuf *m, uint64_t dst, void *brport)
 	counters_pkt(ifp->if_counters, ifc_ipackets, ifc_ibytes, len);
 
 #if NBPFILTER > 0
-	if_bpf = ifp->if_bpf;
+	if_bpf = READ_ONCE(ifp->if_bpf);
 	if (if_bpf) {
 		if (bpf_mtap(if_bpf, m, 0))
 			goto drop;
-- 
2.20.1