From nobody Fri Dec 19 01:40:47 2025 Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.100]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 78A1563B8; Fri, 15 Dec 2023 05:25:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="fvMGkubo" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1702617940; x=1734153940; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=g9l8RslOMp5ad/gXCRHw+j360xuk1nb3+acdwFrlL50=; b=fvMGkubomAMD/MJfSMlJqb3MqwS+58jQzk6tsPXc8bdn2rn3egZpBTyZ DiWxatUcux5+fgTtvMPD6TNHnqTK5gCkq8l0ln9O23TAEj9sGMDdYnuHP Gs7znb4A4EoXQq4uILh/YpuF8wv4lxuKLKK/BZHbbhZR6VPZLKZBL9oFc Xj6jkgjslv96PJedaI9YGEx8M2fWgyMkPpa3g6PVFVSdLYwdrfB0ty8p1 +029a1EmXJ2dQdoCY2UYoyh0XaiqMauo0b96sDT3AgxBVPGAtosysVv/M ov2IUJVUalOiGDr0qGptzavBW8gSecVjT+kHB58HuCEnxXgxYzERjhiAV A==; X-IronPort-AV: E=McAfee;i="6600,9927,10924"; a="461695023" X-IronPort-AV: E=Sophos;i="6.04,277,1695711600"; d="scan'208";a="461695023" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Dec 2023 21:25:39 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10924"; a="808847937" X-IronPort-AV: E=Sophos;i="6.04,277,1695711600"; d="scan'208";a="808847937" Received: from mmtakalk-mobl.amr.corp.intel.com (HELO [192.168.1.200]) ([10.212.109.101]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Dec 2023 21:25:38 -0800 From: Vishal Verma Date: Thu, 14 Dec 2023 22:25:27 -0700 Subject: [PATCH v6 2/4] dax/bus: Use guard(device) in sysfs attribute helpers Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20231214-vv-dax_abi-v6-2-ad900d698438@intel.com> References: <20231214-vv-dax_abi-v6-0-ad900d698438@intel.com> In-Reply-To: <20231214-vv-dax_abi-v6-0-ad900d698438@intel.com> To: Dan Williams , Vishal Verma , Dave Jiang , Andrew Morton , Oscar Salvador Cc: linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, David Hildenbrand , Dave Hansen , Huang Ying , Greg Kroah-Hartman , linux-mm@kvack.org, Joao Martins X-Mailer: b4 0.13-dev-433a8 X-Developer-Signature: v=1; a=openpgp-sha256; l=7001; i=vishal.l.verma@intel.com; h=from:subject:message-id; bh=g9l8RslOMp5ad/gXCRHw+j360xuk1nb3+acdwFrlL50=; b=owGbwMvMwCXGf25diOft7jLG02pJDKnVj/23PV4Tsi/68R5Hl9unM3Y0djytWdHAbcGkJ6wik Xx6GsP5jlIWBjEuBlkxRZa/ez4yHpPbns8TmOAIM4eVCWQIAxenAEykr57hf0DG/93heXPCGta+ VdH15phpYq+zb1lQoDBvzzV7Xmm3bEaG70EflVMniO1OexLerz/H53mywgcvmXW6Pzq2vT/JGvK bGQA= X-Developer-Key: i=vishal.l.verma@intel.com; a=openpgp; fpr=F8682BE134C67A12332A2ED07AFA61BEA3B84DFF Use the guard(device) macro to lock a 'struct device', and unlock it automatically when going out of scope using Scope Based Resource Management semantics. A lot of the sysfs attribute writes in drivers/dax/bus.c benefit from a cleanup using these, so change these where applicable. Cc: Joao Martins Cc: Dan Williams Signed-off-by: Vishal Verma Reviewed-by: Jonathan Cameron --- drivers/dax/bus.c | 143 ++++++++++++++++++++++----------------------------= ---- 1 file changed, 59 insertions(+), 84 deletions(-) diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c index 1ff1ab5fa105..6226de131d17 100644 --- a/drivers/dax/bus.c +++ b/drivers/dax/bus.c @@ -294,13 +294,10 @@ static ssize_t available_size_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dax_region *dax_region =3D dev_get_drvdata(dev); - unsigned long long size; =20 - device_lock(dev); - size =3D dax_region_avail_size(dax_region); - device_unlock(dev); + guard(device)(dev); =20 - return sprintf(buf, "%llu\n", size); + return sprintf(buf, "%llu\n", dax_region_avail_size(dax_region)); } static DEVICE_ATTR_RO(available_size); =20 @@ -309,17 +306,14 @@ static ssize_t seed_show(struct device *dev, { struct dax_region *dax_region =3D dev_get_drvdata(dev); struct device *seed; - ssize_t rc; =20 if (is_static(dax_region)) return -EINVAL; =20 - device_lock(dev); + guard(device)(dev); seed =3D dax_region->seed; - rc =3D sprintf(buf, "%s\n", seed ? dev_name(seed) : ""); - device_unlock(dev); =20 - return rc; + return sprintf(buf, "%s\n", seed ? dev_name(seed) : ""); } static DEVICE_ATTR_RO(seed); =20 @@ -328,24 +322,28 @@ static ssize_t create_show(struct device *dev, { struct dax_region *dax_region =3D dev_get_drvdata(dev); struct device *youngest; - ssize_t rc; =20 if (is_static(dax_region)) return -EINVAL; =20 - device_lock(dev); + guard(device)(dev); youngest =3D dax_region->youngest; - rc =3D sprintf(buf, "%s\n", youngest ? dev_name(youngest) : ""); - device_unlock(dev); =20 - return rc; + return sprintf(buf, "%s\n", youngest ? dev_name(youngest) : ""); } =20 static ssize_t create_store(struct device *dev, struct device_attribute *a= ttr, const char *buf, size_t len) { struct dax_region *dax_region =3D dev_get_drvdata(dev); + struct dev_dax_data data =3D { + .dax_region =3D dax_region, + .size =3D 0, + .id =3D -1, + .memmap_on_memory =3D false, + }; unsigned long long avail; + struct dev_dax *dev_dax; ssize_t rc; int val; =20 @@ -358,38 +356,25 @@ static ssize_t create_store(struct device *dev, struc= t device_attribute *attr, if (val !=3D 1) return -EINVAL; =20 - device_lock(dev); + guard(device)(dev); avail =3D dax_region_avail_size(dax_region); if (avail =3D=3D 0) - rc =3D -ENOSPC; - else { - struct dev_dax_data data =3D { - .dax_region =3D dax_region, - .size =3D 0, - .id =3D -1, - .memmap_on_memory =3D false, - }; - struct dev_dax *dev_dax =3D devm_create_dev_dax(&data); + return -ENOSPC; =20 - if (IS_ERR(dev_dax)) - rc =3D PTR_ERR(dev_dax); - else { - /* - * In support of crafting multiple new devices - * simultaneously multiple seeds can be created, - * but only the first one that has not been - * successfully bound is tracked as the region - * seed. - */ - if (!dax_region->seed) - dax_region->seed =3D &dev_dax->dev; - dax_region->youngest =3D &dev_dax->dev; - rc =3D len; - } - } - device_unlock(dev); + dev_dax =3D devm_create_dev_dax(&data); + if (IS_ERR(dev_dax)) + return PTR_ERR(dev_dax); =20 - return rc; + /* + * In support of crafting multiple new devices simultaneously multiple + * seeds can be created, but only the first one that has not been + * successfully bound is tracked as the region seed. + */ + if (!dax_region->seed) + dax_region->seed =3D &dev_dax->dev; + dax_region->youngest =3D &dev_dax->dev; + + return len; } static DEVICE_ATTR_RW(create); =20 @@ -481,12 +466,9 @@ static int __free_dev_dax_id(struct dev_dax *dev_dax) static int free_dev_dax_id(struct dev_dax *dev_dax) { struct device *dev =3D &dev_dax->dev; - int rc; =20 - device_lock(dev); - rc =3D __free_dev_dax_id(dev_dax); - device_unlock(dev); - return rc; + guard(device)(dev); + return __free_dev_dax_id(dev_dax); } =20 static int alloc_dev_dax_id(struct dev_dax *dev_dax) @@ -908,9 +890,8 @@ static ssize_t size_show(struct device *dev, struct dev_dax *dev_dax =3D to_dev_dax(dev); unsigned long long size; =20 - device_lock(dev); + guard(device)(dev); size =3D dev_dax_size(dev_dax); - device_unlock(dev); =20 return sprintf(buf, "%llu\n", size); } @@ -1080,17 +1061,16 @@ static ssize_t size_store(struct device *dev, struc= t device_attribute *attr, return -EINVAL; } =20 - device_lock(dax_region->dev); - if (!dax_region->dev->driver) { - device_unlock(dax_region->dev); + guard(device)(dax_region->dev); + if (!dax_region->dev->driver) return -ENXIO; - } - device_lock(dev); + + guard(device)(dev); rc =3D dev_dax_resize(dax_region, dev_dax, val); - device_unlock(dev); - device_unlock(dax_region->dev); + if (rc) + return rc; =20 - return rc =3D=3D 0 ? len : rc; + return len; } static DEVICE_ATTR_RW(size); =20 @@ -1137,21 +1117,20 @@ static ssize_t mapping_store(struct device *dev, st= ruct device_attribute *attr, if (rc) return rc; =20 - rc =3D -ENXIO; - device_lock(dax_region->dev); - if (!dax_region->dev->driver) { - device_unlock(dax_region->dev); - return rc; - } - device_lock(dev); + guard(device)(dax_region->dev); + if (!dax_region->dev->driver) + return -ENXIO; =20 + guard(device)(dev); to_alloc =3D range_len(&r); - if (alloc_is_aligned(dev_dax, to_alloc)) - rc =3D alloc_dev_dax_range(dev_dax, r.start, to_alloc); - device_unlock(dev); - device_unlock(dax_region->dev); + if (!alloc_is_aligned(dev_dax, to_alloc)) + return -ENXIO; =20 - return rc =3D=3D 0 ? len : rc; + rc =3D alloc_dev_dax_range(dev_dax, r.start, to_alloc); + if (rc) + return rc; + + return len; } static DEVICE_ATTR_WO(mapping); =20 @@ -1196,27 +1175,23 @@ static ssize_t align_store(struct device *dev, stru= ct device_attribute *attr, if (!dax_align_valid(val)) return -EINVAL; =20 - device_lock(dax_region->dev); - if (!dax_region->dev->driver) { - device_unlock(dax_region->dev); + guard(device)(dax_region->dev); + if (!dax_region->dev->driver) return -ENXIO; - } =20 - device_lock(dev); - if (dev->driver) { - rc =3D -EBUSY; - goto out_unlock; - } + guard(device)(dev); + if (dev->driver) + return -EBUSY; =20 align_save =3D dev_dax->align; dev_dax->align =3D val; rc =3D dev_dax_validate_align(dev_dax); - if (rc) + if (rc) { dev_dax->align =3D align_save; -out_unlock: - device_unlock(dev); - device_unlock(dax_region->dev); - return rc =3D=3D 0 ? len : rc; + return rc; + } + + return len; } static DEVICE_ATTR_RW(align); =20 --=20 2.41.0