From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0A47C4332F for ; Mon, 11 Apr 2022 10:27:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345510AbiDKKaK (ORCPT ); Mon, 11 Apr 2022 06:30:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43854 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232344AbiDKKaF (ORCPT ); Mon, 11 Apr 2022 06:30:05 -0400 Received: from mail.netfilter.org (mail.netfilter.org [217.70.188.207]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 3AA8A3DDE7; Mon, 11 Apr 2022 03:27:52 -0700 (PDT) Received: from localhost.localdomain (unknown [78.30.32.163]) by mail.netfilter.org (Postfix) with ESMTPSA id D3E4163032; Mon, 11 Apr 2022 12:23:50 +0200 (CEST) From: Pablo Neira Ayuso To: netfilter-devel@vger.kernel.org Cc: davem@davemloft.net, netdev@vger.kernel.org, kuba@kernel.org Subject: [PATCH net-next 04/11] netfilter: cttimeout: inc/dec module refcount per object, not per use refcount Date: Mon, 11 Apr 2022 12:27:37 +0200 Message-Id: <20220411102744.282101-5-pablo@netfilter.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220411102744.282101-1-pablo@netfilter.org> References: <20220411102744.282101-1-pablo@netfilter.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org From: Florian Westphal There is no need to increment the module refcount again, its enough to obtain one reference per object, i.e. take a reference on object creation and put it on object destruction. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nfnetlink_cttimeout.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c index b0d8888a539b..eea486f32971 100644 --- a/net/netfilter/nfnetlink_cttimeout.c +++ b/net/netfilter/nfnetlink_cttimeout.c @@ -158,6 +158,7 @@ static int cttimeout_new_timeout(struct sk_buff *skb, timeout->timeout.l3num = l3num; timeout->timeout.l4proto = l4proto; refcount_set(&timeout->refcnt, 1); + __module_get(THIS_MODULE); list_add_tail_rcu(&timeout->head, &pernet->nfct_timeout_list); return 0; @@ -506,13 +507,8 @@ static struct nf_ct_timeout *ctnl_timeout_find_get(struct net *net, if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0) continue; - if (!try_module_get(THIS_MODULE)) + if (!refcount_inc_not_zero(&timeout->refcnt)) goto err; - - if (!refcount_inc_not_zero(&timeout->refcnt)) { - module_put(THIS_MODULE); - goto err; - } matching = timeout; break; } @@ -525,10 +521,10 @@ static void ctnl_timeout_put(struct nf_ct_timeout *t) struct ctnl_timeout *timeout = container_of(t, struct ctnl_timeout, timeout); - if (refcount_dec_and_test(&timeout->refcnt)) + if (refcount_dec_and_test(&timeout->refcnt)) { kfree_rcu(timeout, rcu_head); - - module_put(THIS_MODULE); + module_put(THIS_MODULE); + } } static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = { -- 2.30.2