From patchwork Mon Sep 27 22:00:36 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luis Chamberlain X-Patchwork-Id: 12520931 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 C0607C433EF for ; Mon, 27 Sep 2021 22:01:15 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 903C161058 for ; Mon, 27 Sep 2021 22:01:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 903C161058 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.197200.350197 (Exim 4.92) (envelope-from ) id 1mUygN-0001ge-Lf; Mon, 27 Sep 2021 22:01:07 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 197200.350197; Mon, 27 Sep 2021 22:01:07 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mUygN-0001gS-Hz; Mon, 27 Sep 2021 22:01:07 +0000 Received: by outflank-mailman (input) for mailman id 197200; Mon, 27 Sep 2021 22:01:06 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mUygM-0000mS-EQ for xen-devel@lists.xenproject.org; Mon, 27 Sep 2021 22:01:06 +0000 Received: from bombadil.infradead.org (unknown [2607:7c80:54:e::133]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 44ecce16-2260-4fbf-be97-3488afd89593; Mon, 27 Sep 2021 22:00:49 +0000 (UTC) Received: from mcgrof by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mUyfw-004SvG-Ll; Mon, 27 Sep 2021 22:00:40 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list X-Inumbo-ID: 44ecce16-2260-4fbf-be97-3488afd89593 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=hsYRy5mW2eSZFEqOw8JTWcpX/S1jq2Dljgzx3k3VBB0=; b=VUhrw8hzQFU5q/FEnWuCu9vNeC DCvMINggtEXTZJxRA2FK/rIecWzokE3v00zXQby0C8xhCkSHSknRiHDJShGvvg5/WB7yFgDIDckZK PpnRl/rPKh332VtV3wML8z1zrXFA3i55GxnQCfAaEYw70wUGbzTEjF/468zPMAbP4jhENcEZMIqJm 2Mu0n0pLv7IctMpH2UsQFSSaGesroZ0HRe1tGdCY1b4Bk06qhpX4Xv9n9tTQWerqKdilNkIIQwwUJ 1JFfO38L6zcxmIzVXP2nckVh/bimkBRtBsjOqfHtqRjhaQH2lAQbVW3sNXoQ6wYWq6VFluDHCOtLw Cug+py4Q==; From: Luis Chamberlain To: axboe@kernel.dk, colyli@suse.de, kent.overstreet@gmail.com, kbusch@kernel.org, sagi@grimberg.me, vishal.l.verma@intel.com, dan.j.williams@intel.com, dave.jiang@intel.com, ira.weiny@intel.com, konrad.wilk@oracle.com, roger.pau@citrix.com, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, minchan@kernel.org, ngupta@vflare.org, senozhatsky@chromium.org Cc: xen-devel@lists.xenproject.org, nvdimm@lists.linux.dev, linux-nvme@lists.infradead.org, linux-bcache@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Luis Chamberlain Subject: [PATCH v2 07/10] nvdimm/blk: avoid calling del_gendisk() on early failures Date: Mon, 27 Sep 2021 15:00:36 -0700 Message-Id: <20210927220039.1064193-8-mcgrof@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210927220039.1064193-1-mcgrof@kernel.org> References: <20210927220039.1064193-1-mcgrof@kernel.org> MIME-Version: 1.0 Sender: Luis Chamberlain 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 --- 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 088d3dd6f6fa..591fa1f86f1e 100644 --- a/drivers/nvdimm/blk.c +++ b/drivers/nvdimm/blk.c @@ -240,6 +240,7 @@ 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); @@ -256,20 +257,26 @@ 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)