From patchwork Sat Aug 27 07:20:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Ziyang Xuan (William)" X-Patchwork-Id: 12956838 X-Patchwork-Delegate: kuba@kernel.org 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 8E98CC0502E for ; Sat, 27 Aug 2022 07:20:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232760AbiH0HU3 (ORCPT ); Sat, 27 Aug 2022 03:20:29 -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 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: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org 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 == oskb && this_cpu_ptr(ro->uniq)->skbcnt == 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 = oskb; this_cpu_ptr(ro->uniq)->skbcnt = can_skb_prv(oskb)->skbcnt;