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=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 1D3A8C433E0 for ; Fri, 17 Jul 2020 08:51:07 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D7ED42070E for ; Fri, 17 Jul 2020 08:51:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D7ED42070E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 79C9C6B0031; Fri, 17 Jul 2020 04:51:06 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 726416B0032; Fri, 17 Jul 2020 04:51:06 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5ED456B0033; Fri, 17 Jul 2020 04:51:06 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0135.hostedemail.com [216.40.44.135]) by kanga.kvack.org (Postfix) with ESMTP id 448FD6B0031 for ; Fri, 17 Jul 2020 04:51:06 -0400 (EDT) Received: from smtpin14.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 037A22194A for ; Fri, 17 Jul 2020 08:51:06 +0000 (UTC) X-FDA: 77046948132.14.bomb90_390a2b426f09 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin14.hostedemail.com (Postfix) with ESMTP id 096A71800455A for ; Fri, 17 Jul 2020 08:50:36 +0000 (UTC) X-HE-Tag: bomb90_390a2b426f09 X-Filterd-Recvd-Size: 3581 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by imf01.hostedemail.com (Postfix) with ESMTP for ; Fri, 17 Jul 2020 08:50:34 +0000 (UTC) IronPort-SDR: kKt4VgKLNf+snDy46JP0A0gp3Z1zjL0KlztMuXkLUZyJJvfAgJPC2j3LvvD/2RWTIFB9f+0gor hGNuFLcZGuhw== X-IronPort-AV: E=McAfee;i="6000,8403,9684"; a="149535835" X-IronPort-AV: E=Sophos;i="5.75,362,1589266800"; d="scan'208";a="149535835" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga103.jf.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 X-Rspamd-Queue-Id: 096A71800455A X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 *d= ax_dev, id =3D dax_read_lock(); len =3D dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn); len2 =3D dax_direct_access(dax_dev, pgoff_end, 1, &end_kaddr, &end_pfn)= ; - dax_read_unlock(id); =20 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; } =20 @@ -137,6 +137,7 @@ bool __generic_fsdax_supported(struct dax_device *dax= _dev, put_dev_pagemap(end_pgmap); =20 } + dax_read_unlock(id); =20 if (!dax_enabled) { pr_debug("%s: error: dax support not enabled\n", --=20 2.28.0.rc0.12.gb6a658bd00c9