From: Gao feng <gaofeng@cn.fujitsu.com>
Date: Thu, 21 Jun 2012 04:36:41 +0000 (+0000)
Subject: netfilter: nf_conntrack: use l4proto->users as refcount for per-net data
X-Git-Tag: v3.6-rc1~125^2~281^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fa34fff5e69cc56eecf26754c9b57403899ebd0d;p=pandora-kernel.git

netfilter: nf_conntrack: use l4proto->users as refcount for per-net data

Currently, nf_proto_net's l4proto->users meaning is quite confusing
since it depends on the compilation tweaks.

To resolve this, we cleanup this code to regard it as the refcount
for l4proto's per-net data, since there may be two l4protos use the
same per-net data.

Thus, we increment pn->users when nf_conntrack_l4proto_register
successfully, and decrement it for nf_conntrack_l4_unregister case.

The users refcnt is not required form layer 3 protocol trackers.

Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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