From patchwork Fri Jul 17 07:20:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 11669285 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2DA4B618 for ; Fri, 17 Jul 2020 07:21:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1E5A02083E for ; Fri, 17 Jul 2020 07:21:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728267AbgGQHVt (ORCPT ); Fri, 17 Jul 2020 03:21:49 -0400 Received: from mga14.intel.com ([192.55.52.115]:54609 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728054AbgGQHVI (ORCPT ); Fri, 17 Jul 2020 03:21:08 -0400 IronPort-SDR: SVLSuXSirVpLmqh3r7+wgLaV0teCx1Ly4zniGPTMYpWCqi4slXe0KmzM9ciKktl+EFVhI5AW7H 9UrnB1DAU9SA== X-IronPort-AV: E=McAfee;i="6000,8403,9684"; a="148708703" X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="148708703" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jul 2020 00:21:07 -0700 IronPort-SDR: d+rBzvIqgHnaR+GhYVSKdQJaqDgG6px7MwHBlQpAXhhFUwBpMJADWMQT0thDv3dy+A5eGuvTxT jexEd3Xx6KHQ== X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="486880410" Received: from iweiny-desk2.sc.intel.com (HELO localhost) ([10.3.52.147]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jul 2020 00:21:06 -0700 From: ira.weiny@intel.com To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Andy Lutomirski , Peter Zijlstra Cc: Ira Weiny , Dan Williams , x86@kernel.org, Dave Hansen , Vishal Verma , Andrew Morton , Fenghua Yu , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: [PATCH RFC V2 11/17] drivers/dax: Expand lock scope to cover the use of addresses Date: Fri, 17 Jul 2020 00:20:50 -0700 Message-Id: <20200717072056.73134-12-ira.weiny@intel.com> X-Mailer: git-send-email 2.28.0.rc0.12.gb6a658bd00c9 In-Reply-To: <20200717072056.73134-1-ira.weiny@intel.com> References: <20200717072056.73134-1-ira.weiny@intel.com> MIME-Version: 1.0 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Ira Weiny The addition of PKS protection to dax read lock/unlock will require that the address returned by dax_direct_access() be protected by this lock. While not technically necessary for this series, this corrects the locking by ensuring that the use of kaddr and end_kaddr are covered by the dax read lock/unlock. Change the lock scope to cover the kaddr and end_kaddr use. Reviewed-by: Dan Williams Signed-off-by: Ira Weiny --- drivers/dax/super.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 8e32345be0f7..021739768093 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -103,11 +103,11 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev, id = dax_read_lock(); len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn); len2 = dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn); - dax_read_unlock(id); if (len < 1 || len2 < 1) { pr_debug("%s: error: dax access failed (%ld)\n", bdevname(bdev, buf), len < 1 ? len : len2); + dax_read_unlock(id); return false; } @@ -137,6 +137,7 @@ bool __generic_fsdax_supported(struct dax_device *dax_dev, put_dev_pagemap(end_pgmap); } + dax_read_unlock(id); if (!dax_enabled) { pr_debug("%s: error: dax support not enabled\n",