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=-14.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 6DA2CC4332F for ; Sat, 4 Sep 2021 01:46:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5373761051 for ; Sat, 4 Sep 2021 01:46:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351199AbhIDBre (ORCPT ); Fri, 3 Sep 2021 21:47:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52090 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231389AbhIDBre (ORCPT ); Fri, 3 Sep 2021 21:47:34 -0400 Received: from bombadil.infradead.org (unknown [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9F1F6C061575; Fri, 3 Sep 2021 18:46:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Sender:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=emXHCsSESDsYXgDCyO6guaMlmVA/Vr3ZoS3mPS968XI=; b=c5XTnTtIW70QIk/iVIvzb87JqI tcT6qmY0efhEByu3yHG3p3VkkNGOyvSC3Qzi3Rn531DUP7oflNexg74DFSPZhSkjAQgPmwewphC/6 15RYnx5OSbnGFML3VcF08GO6poVHJBYxEXOeQKreYYZ9NeTiNb0KI81iI/KO1cvzX8bvKgRKPlNKI Mmmxhy4Zk6EV2DJEWS7sgmKTDPA5PFD17EJj3P3ozicrR5I23lkS3YoDhGa7fDEYz73HOICanJRmR OupJiQBNOPTq+2llAsgwuYjfz/JGKwLDBGSA+iLKuFjUFPnkEexHGj/Rb7QY1jlzJDg/fXmzl6DtQ AVXG3Iag==; Received: from mcgrof by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mMKlG-00DMId-9g; Sat, 04 Sep 2021 01:46:26 +0000 Date: Fri, 3 Sep 2021 18:46:26 -0700 From: Luis Chamberlain To: Heiko Carstens Cc: axboe@kernel.dk, gregkh@linuxfoundation.org, chaitanya.kulkarni@wdc.com, atulgopinathan@gmail.com, hare@suse.de, maximlevitsky@gmail.com, oakad@yahoo.com, ulf.hansson@linaro.org, colin.king@canonical.com, shubhankarvk@gmail.com, baijiaju1990@gmail.com, trix@redhat.com, dongsheng.yang@easystack.cn, ceph-devel@vger.kernel.org, miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, sth@linux.ibm.com, hoeppner@linux.ibm.com, gor@linux.ibm.com, borntraeger@de.ibm.com, oberpar@linux.ibm.com, tj@kernel.org, linux-s390@vger.kernel.org, linux-mtd@lists.infradead.org, linux-mmc@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Gerald Schaefer Subject: Re: [PATCH 7/9] s390/block/dcssblk: add error handling support for add_disk() Message-ID: References: <20210902174105.2418771-1-mcgrof@kernel.org> <20210902174105.2418771-8-mcgrof@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: Luis Chamberlain Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On Fri, Sep 03, 2021 at 04:08:48PM +0200, Heiko Carstens wrote: > On Thu, Sep 02, 2021 at 10:41:03AM -0700, Luis Chamberlain wrote: > > We never checked for errors on add_disk() as this function > > returned void. Now that this is fixed, use the shiny new > > error handling. > > > > Signed-off-by: Luis Chamberlain > > --- > > drivers/s390/block/dcssblk.c | 4 +++- > > 1 file changed, 3 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c > > index 5be3d1c39a78..b0fd5009a12e 100644 > > --- a/drivers/s390/block/dcssblk.c > > +++ b/drivers/s390/block/dcssblk.c > > @@ -696,7 +696,9 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char > > } > > > > get_device(&dev_info->dev); > > - device_add_disk(&dev_info->dev, dev_info->gd, NULL); > > + rc = device_add_disk(&dev_info->dev, dev_info->gd, NULL); > > + if (rc) > > + goto put_dev; > > This looks not correct to me. We seem to have now in case of an error: > > - reference count imbalance (= memory leak) > - dax cleanup is missing Care to provide an alternative? Luis