From patchwork Wed Nov 3 12:21:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luis Chamberlain X-Patchwork-Id: 12600707 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D398FC433F5 for ; Wed, 3 Nov 2021 12:22:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BF1B961151 for ; Wed, 3 Nov 2021 12:22:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231961AbhKCMYs (ORCPT ); Wed, 3 Nov 2021 08:24:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57218 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229816AbhKCMYq (ORCPT ); Wed, 3 Nov 2021 08:24:46 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 54B62C061714; Wed, 3 Nov 2021 05:22:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=Qm4nUrQ9r/xq63ubvM6FieDZh50JA6iSrBnuQJ7/7WU=; b=M+Oypal1iAVBDDaM9DOpYwpiB4 uRcbYqamzTqlYKoGlEPPZ1CjXrPz3r/nk7K2arW5FD6UJUkLd9HwFC0V/vL++oK5n9gpRR9rF8a+n 9T8ijZ/qb5+hkyt63Al+PAW3Tbq8FErRaU+BMbOu9yTUIrO9cjJrCcOhgnV0gmNSRIDQXQBTLZrQj q2mkasBhzGKeRI/HKOPkUAC/qLIjHZBZF4O6SYMPlulAIevHMsgwVaFIKfYvruiBqOe1ciNKxb0vd kNNOIzdz+mtdcUTaYa7iDlQ88VroT5Ia9gP8r9S+Sc/j8VglE8zoasFeL0bqjq8Zr4Aa0fkJ+7Zmn WSJ/Vegw==; Received: from mcgrof by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1miFHC-0056IG-8m; Wed, 03 Nov 2021 12:21:58 +0000 From: Luis Chamberlain To: axboe@kernel.dk, hch@lst.de, penguin-kernel@i-love.sakura.ne.jp, dan.j.williams@intel.com, vishal.l.verma@intel.com, dave.jiang@intel.com, ira.weiny@intel.com, richard@nod.at, miquel.raynal@bootlin.com, vigneshr@ti.com, efremov@linux.com, song@kernel.org, martin.petersen@oracle.com, hare@suse.de, jack@suse.cz, ming.lei@redhat.com, tj@kernel.org, mcgrof@kernel.org Cc: linux-mtd@lists.infradead.org, linux-scsi@vger.kernel.org, linux-raid@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 04/13] nvdimm/blk: avoid calling del_gendisk() on early failures Date: Wed, 3 Nov 2021 05:21:48 -0700 Message-Id: <20211103122157.1215783-5-mcgrof@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211103122157.1215783-1-mcgrof@kernel.org> References: <20211103122157.1215783-1-mcgrof@kernel.org> MIME-Version: 1.0 Sender: Luis Chamberlain Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org If nd_integrity_init() fails we'd get del_gendisk() called, but that's not correct as we should only call that if we're done with device_add_disk(). Fix this by providing unwinding prior to the devm call being registered and moving the devm registration to the very end. This should fix calling del_gendisk() if nd_integrity_init() fails. I only spotted this issue through code inspection. It does not fix any real world bug. Signed-off-by: Luis Chamberlain Reviewed-by: Christoph Hellwig --- drivers/nvdimm/blk.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/nvdimm/blk.c b/drivers/nvdimm/blk.c index b6c6866f9259..4eef67918a7e 100644 --- a/drivers/nvdimm/blk.c +++ b/drivers/nvdimm/blk.c @@ -239,6 +239,7 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk) resource_size_t available_disk_size; struct gendisk *disk; u64 internal_nlba; + int rc; internal_nlba = div_u64(nsblk->size, nsblk_internal_lbasize(nsblk)); available_disk_size = internal_nlba * nsblk_sector_size(nsblk); @@ -255,20 +256,26 @@ static int nsblk_attach_disk(struct nd_namespace_blk *nsblk) blk_queue_logical_block_size(disk->queue, nsblk_sector_size(nsblk)); blk_queue_flag_set(QUEUE_FLAG_NONROT, disk->queue); - if (devm_add_action_or_reset(dev, nd_blk_release_disk, disk)) - return -ENOMEM; - if (nsblk_meta_size(nsblk)) { - int rc = nd_integrity_init(disk, nsblk_meta_size(nsblk)); + rc = nd_integrity_init(disk, nsblk_meta_size(nsblk)); if (rc) - return rc; + goto out_before_devm_err; } set_capacity(disk, available_disk_size >> SECTOR_SHIFT); device_add_disk(dev, disk, NULL); + + /* nd_blk_release_disk() is called if this fails */ + if (devm_add_action_or_reset(dev, nd_blk_release_disk, disk)) + return -ENOMEM; + nvdimm_check_and_set_ro(disk); return 0; + +out_before_devm_err: + blk_cleanup_disk(disk); + return rc; } static int nd_blk_probe(struct device *dev)