From nobody Tue Apr 7 13:29:06 2026 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 780B0ECAAD2 for ; Sat, 27 Aug 2022 07:20:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345349AbiH0HUh (ORCPT ); Sat, 27 Aug 2022 03:20:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53076 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232922AbiH0HUX (ORCPT ); Sat, 27 Aug 2022 03:20:23 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01C807CA9A; Sat, 27 Aug 2022 00:20:21 -0700 (PDT) Received: from canpemm500006.china.huawei.com (unknown [172.30.72.55]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4MF7L5435vz1N7H4; Sat, 27 Aug 2022 15:16:45 +0800 (CST) Received: from ubuntu-82.huawei.com (10.175.104.82) by canpemm500006.china.huawei.com (7.192.105.130) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Sat, 27 Aug 2022 15:20:18 +0800 From: Ziyang Xuan To: , , , CC: , , , , Subject: [PATCH net-next 1/2] can: raw: process optimization in raw_init() Date: Sat, 27 Aug 2022 15:20:10 +0800 Message-ID: <7af9401f0d2d9fed36c1667b5ac9b8df8f8b87ee.1661584485.git.william.xuanziyang@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.104.82] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To canpemm500006.china.huawei.com (7.192.105.130) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Now, register notifier after register proto successfully. It can create raw socket and set socket options once register proto successfully, so it is possible missing notifier event before register notifier successfully although this is a low probability scenario. Move notifier registration to the front of proto registration like done in j1939. In addition, register_netdevice_notifier() may fail, check its result is necessary. Signed-off-by: Ziyang Xuan --- net/can/raw.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/net/can/raw.c b/net/can/raw.c index d1bd9cc51ebe..9ae7c4206b9a 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -942,12 +942,20 @@ static __init int raw_module_init(void) =20 pr_info("can: raw protocol\n"); =20 + err =3D register_netdevice_notifier(&canraw_notifier); + if (err) + return err; + err =3D can_proto_register(&raw_can_proto); - if (err < 0) + if (err < 0) { pr_err("can: registration of raw protocol failed\n"); - else - register_netdevice_notifier(&canraw_notifier); + goto register_proto_failed; + } =20 + return 0; + +register_proto_failed: + unregister_netdevice_notifier(&canraw_notifier); return err; } =20 --=20 2.25.1 From nobody Tue Apr 7 13:29:06 2026 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 66BF7C0502C for ; Sat, 27 Aug 2022 07:20:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233073AbiH0HUc (ORCPT ); Sat, 27 Aug 2022 03:20:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232449AbiH0HUX (ORCPT ); Sat, 27 Aug 2022 03:20:23 -0400 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01B477C74B; Sat, 27 Aug 2022 00:20:21 -0700 (PDT) Received: from canpemm500006.china.huawei.com (unknown [172.30.72.55]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4MF7L60z9mz1N7Gs; Sat, 27 Aug 2022 15:16:46 +0800 (CST) Received: from ubuntu-82.huawei.com (10.175.104.82) by canpemm500006.china.huawei.com (7.192.105.130) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Sat, 27 Aug 2022 15:20:19 +0800 From: Ziyang Xuan To: , , , CC: , , , , Subject: [PATCH net-next 2/2] can: raw: use guard clause to optimize nesting in raw_rcv() Date: Sat, 27 Aug 2022 15:20:11 +0800 Message-ID: <0170ad1f07dbe838965df4274fce950980fa9d1f.1661584485.git.william.xuanziyang@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Originating-IP: [10.175.104.82] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To canpemm500006.china.huawei.com (7.192.105.130) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" We can use guard clause to optimize nesting codes like if (condition) { ... } else { return; } in raw_rcv(); Signed-off-by: Ziyang Xuan --- net/can/raw.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/net/can/raw.c b/net/can/raw.c index 9ae7c4206b9a..e7dfa3584e29 100644 --- a/net/can/raw.c +++ b/net/can/raw.c @@ -136,14 +136,13 @@ static void raw_rcv(struct sk_buff *oskb, void *data) /* eliminate multiple filter matches for the same skb */ if (this_cpu_ptr(ro->uniq)->skb =3D=3D oskb && this_cpu_ptr(ro->uniq)->skbcnt =3D=3D can_skb_prv(oskb)->skbcnt) { - if (ro->join_filters) { - this_cpu_inc(ro->uniq->join_rx_count); - /* drop frame until all enabled filters matched */ - if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count) - return; - } else { + if (!ro->join_filters) + return; + + this_cpu_inc(ro->uniq->join_rx_count); + /* drop frame until all enabled filters matched */ + if (this_cpu_ptr(ro->uniq)->join_rx_count < ro->count) return; - } } else { this_cpu_ptr(ro->uniq)->skb =3D oskb; this_cpu_ptr(ro->uniq)->skbcnt =3D can_skb_prv(oskb)->skbcnt; --=20 2.25.1