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 X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 21C25C433ED for ; Wed, 12 May 2021 14:54:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E1F7A6143A for ; Wed, 12 May 2021 14:54:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231608AbhELOzi (ORCPT ); Wed, 12 May 2021 10:55:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:44480 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231802AbhELOys (ORCPT ); Wed, 12 May 2021 10:54:48 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 95CDD61418; Wed, 12 May 2021 14:53:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620831219; bh=MoSJTMGCnxX7GMOgLJAfRcMP6eNgnyeQqify4I7ODTg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=HYARPbfsb9eIf6UaKNnqrHKjEzD2sMpAyYWeMt2xca26w28jXKW+rOXOfPNILDM1k wDTRrlKWM3xYrFa4RuU1yEDJ9oqQ/imSJWlM45wLbV41R+jFSJPxwyaXmOlltkUsSA qzZmi9ET0ywaCITwDPFy0/w2m77jXrCJcBUGUhxs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Heming Zhao , Christoph Hellwig , Song Liu Subject: [PATCH 5.4 032/244] md: factor out a mddev_find_locked helper from mddev_find Date: Wed, 12 May 2021 16:46:43 +0200 Message-Id: <20210512144744.080759896@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144743.039977287@linuxfoundation.org> References: <20210512144743.039977287@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christoph Hellwig commit 8b57251f9a91f5e5a599de7549915d2d226cc3af upstream. Factor out a self-contained helper to just lookup a mddev by the dev_t "unit". Cc: stable@vger.kernel.org Reviewed-by: Heming Zhao Signed-off-by: Christoph Hellwig Signed-off-by: Song Liu Signed-off-by: Greg Kroah-Hartman --- drivers/md/md.c | 32 +++++++++++++++++++------------- 1 file changed, 19 insertions(+), 13 deletions(-) --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -647,6 +647,17 @@ void mddev_init(struct mddev *mddev) } EXPORT_SYMBOL_GPL(mddev_init); +static struct mddev *mddev_find_locked(dev_t unit) +{ + struct mddev *mddev; + + list_for_each_entry(mddev, &all_mddevs, all_mddevs) + if (mddev->unit == unit) + return mddev; + + return NULL; +} + static struct mddev *mddev_find(dev_t unit) { struct mddev *mddev; @@ -674,13 +685,13 @@ static struct mddev *mddev_find_or_alloc spin_lock(&all_mddevs_lock); if (unit) { - list_for_each_entry(mddev, &all_mddevs, all_mddevs) - if (mddev->unit == unit) { - mddev_get(mddev); - spin_unlock(&all_mddevs_lock); - kfree(new); - return mddev; - } + mddev = mddev_find_locked(unit); + if (mddev) { + mddev_get(mddev); + spin_unlock(&all_mddevs_lock); + kfree(new); + return mddev; + } if (new) { list_add(&new->all_mddevs, &all_mddevs); @@ -706,12 +717,7 @@ static struct mddev *mddev_find_or_alloc return NULL; } - is_free = 1; - list_for_each_entry(mddev, &all_mddevs, all_mddevs) - if (mddev->unit == dev) { - is_free = 0; - break; - } + is_free = !mddev_find_locked(dev); } new->unit = dev; new->md_minor = MINOR(dev);