From patchwork Mon May 20 14:06:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Yan X-Patchwork-Id: 10951213 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 95B0A14B6 for ; Mon, 20 May 2019 13:48:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 867EC287EA for ; Mon, 20 May 2019 13:48:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7AA062886C; Mon, 20 May 2019 13:48:25 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 20F9B287EA for ; Mon, 20 May 2019 13:48:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731648AbfETNsV (ORCPT ); Mon, 20 May 2019 09:48:21 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:8224 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726169AbfETNsV (ORCPT ); Mon, 20 May 2019 09:48:21 -0400 Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 9F584F835939B5E97F30; Mon, 20 May 2019 21:48:17 +0800 (CST) Received: from huawei.com (10.175.124.28) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.439.0; Mon, 20 May 2019 21:48:10 +0800 From: Jason Yan To: , CC: , , , , , , , , , , , Jason Yan Subject: [PATCH v2] scsi: libsas: no need to join wide port again in sas_ex_discover_dev() Date: Mon, 20 May 2019 22:06:00 +0800 Message-ID: <20190520140600.22861-1-yanaijie@huawei.com> X-Mailer: git-send-email 2.17.2 MIME-Version: 1.0 X-Originating-IP: [10.175.124.28] X-CFilter-Loop: Reflected Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Since we are processing events synchronously now, the second call of sas_ex_join_wide_port() in sas_ex_discover_dev() is not needed. There will be no races with other works in disco workqueue. So remove the second sas_ex_join_wide_port(). I did not change the return value of 'res' to error when discover failed because we need to continue to discover other phys if one phy discover failed. So let's keep that logic as before and just add a debug log to detect the failure. And directly return if second fanout expander attatched to the parent expander because it has nothing to do after the phy is disabled. Signed-off-by: Jason Yan Reviewed-by: John Garry --- v2: Directly return in the "second fanout expander" case and change the log level to notice. drivers/scsi/libsas/sas_expander.c | 26 ++++---------------------- 1 file changed, 4 insertions(+), 22 deletions(-) diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c index 83f2fd70ce76..a148be23ca09 100644 --- a/drivers/scsi/libsas/sas_expander.c +++ b/drivers/scsi/libsas/sas_expander.c @@ -1104,7 +1104,7 @@ static int sas_ex_discover_dev(struct domain_device *dev, int phy_id) SAS_ADDR(dev->sas_addr), phy_id); sas_ex_disable_phy(dev, phy_id); - break; + return res; } else memcpy(dev->port->disc.fanout_sas_addr, ex_phy->attached_sas_addr, SAS_ADDR_SIZE); @@ -1116,27 +1116,9 @@ static int sas_ex_discover_dev(struct domain_device *dev, int phy_id) break; } - if (child) { - int i; - - for (i = 0; i < ex->num_phys; i++) { - if (ex->ex_phy[i].phy_state == PHY_VACANT || - ex->ex_phy[i].phy_state == PHY_NOT_PRESENT) - continue; - /* - * Due to races, the phy might not get added to the - * wide port, so we add the phy to the wide port here. - */ - if (SAS_ADDR(ex->ex_phy[i].attached_sas_addr) == - SAS_ADDR(child->sas_addr)) { - ex->ex_phy[i].phy_state= PHY_DEVICE_DISCOVERED; - if (sas_ex_join_wide_port(dev, i)) - pr_debug("Attaching ex phy%02d to wide port %016llx\n", - i, SAS_ADDR(ex->ex_phy[i].attached_sas_addr)); - } - } - } - + if (!child) + pr_notice("ex %016llx phy%02d failed to discover\n", + SAS_ADDR(dev->sas_addr), phy_id); return res; }