From patchwork Fri Apr 21 09:37:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Yan X-Patchwork-Id: 13219714 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 1D551C77B78 for ; Fri, 21 Apr 2023 09:39:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232005AbjDUJjQ (ORCPT ); Fri, 21 Apr 2023 05:39:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232030AbjDUJi5 (ORCPT ); Fri, 21 Apr 2023 05:38:57 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E85639770 for ; Fri, 21 Apr 2023 02:38:53 -0700 (PDT) Received: from canpemm100004.china.huawei.com (unknown [172.30.72.57]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4Q2qCY5sz1zL0WM; Fri, 21 Apr 2023 17:36:09 +0800 (CST) Received: from huawei.com (10.175.127.227) by canpemm100004.china.huawei.com (7.192.105.92) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Fri, 21 Apr 2023 17:38:51 +0800 From: Jason Yan To: , CC: , , , , , , , Jason Yan Subject: [PATCH v3 1/3] scsi: libsas: Simplify sas_check_eeds() Date: Fri, 21 Apr 2023 17:37:42 +0800 Message-ID: <20230421093744.1583609-2-yanaijie@huawei.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230421093744.1583609-1-yanaijie@huawei.com> References: <20230421093744.1583609-1-yanaijie@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.127.227] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To canpemm100004.china.huawei.com (7.192.105.92) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org In sas_check_eeds() there is an empty branch. We can reverse the test expression and then remove the empty branch. Also the the test expression is a little bit complex so it deserves an individual function. And make the continuing prototype lines indented after the opening parenthesis to follow the standard coding style. Signed-off-by: Jason Yan Reviewed-by: Christoph Hellwig --- drivers/scsi/libsas/sas_expander.c | 40 +++++++++++++++--------------- 1 file changed, 20 insertions(+), 20 deletions(-) diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c index dc670304f181..e6101a511cc7 100644 --- a/drivers/scsi/libsas/sas_expander.c +++ b/drivers/scsi/libsas/sas_expander.c @@ -1198,37 +1198,37 @@ static void sas_print_parent_topology_bug(struct domain_device *child, sas_route_char(child, child_phy)); } +static bool sas_eeds_valid(struct domain_device *parent, + struct domain_device *child) +{ + struct sas_discovery *disc = &parent->port->disc; + + return (SAS_ADDR(disc->eeds_a) == SAS_ADDR(parent->sas_addr) || + SAS_ADDR(disc->eeds_a) == SAS_ADDR(child->sas_addr)) && + (SAS_ADDR(disc->eeds_b) == SAS_ADDR(parent->sas_addr) || + SAS_ADDR(disc->eeds_b) == SAS_ADDR(child->sas_addr)); +} + static int sas_check_eeds(struct domain_device *child, - struct ex_phy *parent_phy, - struct ex_phy *child_phy) + struct ex_phy *parent_phy, + struct ex_phy *child_phy) { int res = 0; struct domain_device *parent = child->parent; + struct sas_discovery *disc = &parent->port->disc; - if (SAS_ADDR(parent->port->disc.fanout_sas_addr) != 0) { + if (SAS_ADDR(disc->fanout_sas_addr) != 0) { res = -ENODEV; pr_warn("edge ex %016llx phy S:%02d <--> edge ex %016llx phy S:%02d, while there is a fanout ex %016llx\n", SAS_ADDR(parent->sas_addr), parent_phy->phy_id, SAS_ADDR(child->sas_addr), child_phy->phy_id, - SAS_ADDR(parent->port->disc.fanout_sas_addr)); - } else if (SAS_ADDR(parent->port->disc.eeds_a) == 0) { - memcpy(parent->port->disc.eeds_a, parent->sas_addr, - SAS_ADDR_SIZE); - memcpy(parent->port->disc.eeds_b, child->sas_addr, - SAS_ADDR_SIZE); - } else if (((SAS_ADDR(parent->port->disc.eeds_a) == - SAS_ADDR(parent->sas_addr)) || - (SAS_ADDR(parent->port->disc.eeds_a) == - SAS_ADDR(child->sas_addr))) - && - ((SAS_ADDR(parent->port->disc.eeds_b) == - SAS_ADDR(parent->sas_addr)) || - (SAS_ADDR(parent->port->disc.eeds_b) == - SAS_ADDR(child->sas_addr)))) - ; - else { + SAS_ADDR(disc->fanout_sas_addr)); + } else if (SAS_ADDR(disc->eeds_a) == 0) { + memcpy(disc->eeds_a, parent->sas_addr, SAS_ADDR_SIZE); + memcpy(disc->eeds_b, child->sas_addr, SAS_ADDR_SIZE); + } else if (!sas_eeds_valid(parent, child)) { res = -ENODEV; pr_warn("edge ex %016llx phy%02d <--> edge ex %016llx phy%02d link forms a third EEDS!\n", SAS_ADDR(parent->sas_addr),