From b098744265d4fdde6a3153b292e9416f2b94bef9 Mon Sep 17 00:00:00 2001
From: Alexander Motin <mav@FreeBSD.org>
Date: Thu, 8 Jan 2009 17:51:15 +0000
Subject: [PATCH] Mark ng_vjc node as FORCE_WRITER to protect slcompress state.
 I think it can be the reason of livelock in netgraph reported by some mpd
 users.

MFC after:	3 days
---
 sys/netgraph/ng_vjc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/netgraph/ng_vjc.c b/sys/netgraph/ng_vjc.c
index 5714ac05f57..797b995ca93 100644
--- a/sys/netgraph/ng_vjc.c
+++ b/sys/netgraph/ng_vjc.c
@@ -249,6 +249,9 @@ ng_vjc_constructor(node_p node)
 
 	NG_NODE_SET_PRIVATE(node, priv);
 
+	/* slcompress is not thread-safe. Protect it's state here. */
+	NG_NODE_FORCE_WRITER(node);
+
 	/* Done */
 	return (0);
 }