From d274e6b6411bddf127777c1880d06d5e8e534cd4 Mon Sep 17 00:00:00 2001
From: Max Laier <mlaier@FreeBSD.org>
Date: Mon, 23 May 2005 17:07:16 +0000
Subject: [PATCH] Fix semantics of ph_busy_count == -1 to pass instead of
 block.

PR:		kern/81128
Submitted by:	Joost Bekkers
MFC-after:	2 weeks
---
 sys/net/pfil.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sys/net/pfil.c b/sys/net/pfil.c
index c9b7ce7acce..35ac338095b 100644
--- a/sys/net/pfil.c
+++ b/sys/net/pfil.c
@@ -119,12 +119,14 @@ pfil_run_hooks(struct pfil_head *ph, struct mbuf **mp, struct ifnet *ifp,
 	struct mbuf *m = *mp;
 	int rv = 0;
 
+	if (ph->ph_busy_count == -1)
+		return (0);
 	/*
 	 * Prevent packet filtering from starving the modification of
 	 * the packet filters. We would prefer a reader/writer locking
 	 * mechanism with guaranteed ordering, though.
 	 */
-	if (ph->ph_busy_count == -1 || ph->ph_want_write) {
+	if (ph->ph_want_write) {
 		m_freem(*mp);
 		*mp = NULL;
 		return (ENOBUFS);