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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 42E63C4708C for ; Fri, 28 May 2021 16:16:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1FAB6613E5 for ; Fri, 28 May 2021 16:16:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236826AbhE1QR6 (ORCPT ); Fri, 28 May 2021 12:17:58 -0400 Received: from mga11.intel.com ([192.55.52.93]:29297 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236631AbhE1QRz (ORCPT ); Fri, 28 May 2021 12:17:55 -0400 IronPort-SDR: JsD++xbMH5oayItIKqZAoSc+pEhzU/qCDh24n+hOvsEYH5URbzylbhK2LlMbwD6GT+5+RYR9rY RNRmCWWUADtg== X-IronPort-AV: E=McAfee;i="6200,9189,9998"; a="199948101" X-IronPort-AV: E=Sophos;i="5.83,229,1616482800"; d="scan'208";a="199948101" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 May 2021 09:16:17 -0700 IronPort-SDR: cs/Rf0cL0AJUYxkmRtbrSJ07Pnh+C2DHWFuUVkNT9OHTqFZtb2ygLFCGkqgFtBRlTsu8NfMPtC TyC81juqKOUA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,229,1616482800"; d="scan'208";a="477979748" Received: from yilunxu-optiplex-7050.sh.intel.com (HELO localhost) ([10.239.159.162]) by orsmga001.jf.intel.com with ESMTP; 28 May 2021 09:16:14 -0700 Date: Sat, 29 May 2021 00:10:42 +0800 From: Xu Yilun To: Russ Weight Cc: mdf@kernel.org, linux-fpga@vger.kernel.org, trix@redhat.com, lgoncalv@redhat.com, hao.wu@intel.com, matthew.gerlach@intel.com, richard.gong@intel.com Subject: Re: [PATCH v3 3/3] fpga: region: Use standard dev_release for class driver Message-ID: <20210528161042.GC1881814@yilunxu-OptiPlex-7050> References: <20210524185049.681683-1-russell.h.weight@intel.com> <20210524185049.681683-4-russell.h.weight@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210524185049.681683-4-russell.h.weight@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-fpga@vger.kernel.org On Mon, May 24, 2021 at 11:50:49AM -0700, Russ Weight wrote: > The FPGA region class driver data structure is being treated as a > managed resource instead of using standard dev_release call-back > to release the class data structure. This change removes the > managed resource code and combines the create() and register() > functions into a single register() function. > > Signed-off-by: Russ Weight > --- > v3: > - Cleaned up comment header for fpga_region_register() > - Fix fpga_region_register() error return on ida_simple_get() failure > v2: > - No changes > --- > drivers/fpga/dfl-fme-region.c | 10 +-- > drivers/fpga/dfl.c | 10 +-- > drivers/fpga/fpga-region.c | 103 ++++++------------------------- > drivers/fpga/of-fpga-region.c | 10 +-- > include/linux/fpga/fpga-region.h | 12 +--- > 5 files changed, 32 insertions(+), 113 deletions(-) > > diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c > index 1eeb42af1012..631c8ce160e3 100644 > --- a/drivers/fpga/dfl-fme-region.c > +++ b/drivers/fpga/dfl-fme-region.c > @@ -39,9 +39,9 @@ static int fme_region_probe(struct platform_device *pdev) > if (IS_ERR(mgr)) > return -EPROBE_DEFER; > > - region = devm_fpga_region_create(dev, mgr, fme_region_get_bridges); > - if (!region) { > - ret = -ENOMEM; > + region = fpga_region_register(dev, mgr, fme_region_get_bridges); > + if (IS_ERR(region)) { > + ret = PTR_ERR(region); > goto eprobe_mgr_put; > } > > @@ -49,10 +49,6 @@ static int fme_region_probe(struct platform_device *pdev) > region->compat_id = mgr->compat_id; This is the issue I've mentioned in Patch #1. There is a chance user get zero value via compat_id sysfs node. > platform_set_drvdata(pdev, region); > > - ret = fpga_region_register(region); > - if (ret) > - goto eprobe_mgr_put; > - > dev_dbg(dev, "DFL FME FPGA Region probed\n"); > > return 0; > diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c > index 511b20ff35a3..2fb3a5bfe4df 100644 > --- a/drivers/fpga/dfl.c > +++ b/drivers/fpga/dfl.c > @@ -1400,9 +1400,9 @@ dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info) > if (!cdev) > return ERR_PTR(-ENOMEM); > > - cdev->region = devm_fpga_region_create(info->dev, NULL, NULL); > - if (!cdev->region) { > - ret = -ENOMEM; > + cdev->region = fpga_region_register(info->dev, NULL, NULL); > + if (IS_ERR(cdev->region)) { > + ret = PTR_ERR(cdev->region); > goto free_cdev_exit; > } > > @@ -1410,10 +1410,6 @@ dfl_fpga_feature_devs_enumerate(struct dfl_fpga_enum_info *info) > mutex_init(&cdev->lock); > INIT_LIST_HEAD(&cdev->port_dev_list); How about we moves fpga_region_register() here? It was here before. Thanks, Yilun > > - ret = fpga_region_register(cdev->region); > - if (ret) > - goto free_cdev_exit; > - > /* create and init build info for enumeration */ > binfo = devm_kzalloc(info->dev, sizeof(*binfo), GFP_KERNEL); > if (!binfo) { > diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c > index c3134b89c3fe..f65f60367e2c 100644 > --- a/drivers/fpga/fpga-region.c > +++ b/drivers/fpga/fpga-region.c > @@ -180,39 +180,35 @@ static struct attribute *fpga_region_attrs[] = { > ATTRIBUTE_GROUPS(fpga_region); > > /** > - * fpga_region_create - alloc and init a struct fpga_region > + * fpga_region_register - create and register a FPGA Region device > * @dev: device parent > * @mgr: manager that programs this region > * @get_bridges: optional function to get bridges to a list > * > - * The caller of this function is responsible for freeing the resulting region > - * struct with fpga_region_free(). Using devm_fpga_region_create() instead is > - * recommended. > - * > - * Return: struct fpga_region or NULL > + * Returns a struct fpga_region pointer on success, or ERR_PTR() on error. > */ > -struct fpga_region > -*fpga_region_create(struct device *dev, > - struct fpga_manager *mgr, > - int (*get_bridges)(struct fpga_region *)) > +struct fpga_region * > +fpga_region_register(struct device *dev, struct fpga_manager *mgr, > + int (*get_bridges)(struct fpga_region *)) > { > struct fpga_region *region; > int id, ret = 0; > > region = kzalloc(sizeof(*region), GFP_KERNEL); > if (!region) > - return NULL; > + return ERR_PTR(-ENOMEM); > > id = ida_simple_get(&fpga_region_ida, 0, 0, GFP_KERNEL); > - if (id < 0) > + if (id < 0) { > + ret = id; > goto err_free; > + } > > region->mgr = mgr; > region->get_bridges = get_bridges; > mutex_init(®ion->mutex); > INIT_LIST_HEAD(®ion->bridge_list); > > - device_initialize(®ion->dev); > region->dev.class = fpga_region_class; > region->dev.parent = dev; > region->dev.of_node = dev->of_node; > @@ -222,6 +218,12 @@ struct fpga_region > if (ret) > goto err_remove; > > + ret = device_register(®ion->dev); > + if (ret) { > + put_device(®ion->dev); > + return ERR_PTR(ret); > + } > + > return region; > > err_remove: > @@ -229,76 +231,7 @@ struct fpga_region > err_free: > kfree(region); > > - return NULL; > -} > -EXPORT_SYMBOL_GPL(fpga_region_create); > - > -/** > - * fpga_region_free - free a FPGA region created by fpga_region_create() > - * @region: FPGA region > - */ > -void fpga_region_free(struct fpga_region *region) > -{ > - ida_simple_remove(&fpga_region_ida, region->dev.id); > - kfree(region); > -} > -EXPORT_SYMBOL_GPL(fpga_region_free); > - > -static void devm_fpga_region_release(struct device *dev, void *res) > -{ > - struct fpga_region *region = *(struct fpga_region **)res; > - > - fpga_region_free(region); > -} > - > -/** > - * devm_fpga_region_create - create and initialize a managed FPGA region struct > - * @dev: device parent > - * @mgr: manager that programs this region > - * @get_bridges: optional function to get bridges to a list > - * > - * This function is intended for use in a FPGA region driver's probe function. > - * After the region driver creates the region struct with > - * devm_fpga_region_create(), it should register it with fpga_region_register(). > - * The region driver's remove function should call fpga_region_unregister(). > - * The region struct allocated with this function will be freed automatically on > - * driver detach. This includes the case of a probe function returning error > - * before calling fpga_region_register(), the struct will still get cleaned up. > - * > - * Return: struct fpga_region or NULL > - */ > -struct fpga_region > -*devm_fpga_region_create(struct device *dev, > - struct fpga_manager *mgr, > - int (*get_bridges)(struct fpga_region *)) > -{ > - struct fpga_region **ptr, *region; > - > - ptr = devres_alloc(devm_fpga_region_release, sizeof(*ptr), GFP_KERNEL); > - if (!ptr) > - return NULL; > - > - region = fpga_region_create(dev, mgr, get_bridges); > - if (!region) { > - devres_free(ptr); > - } else { > - *ptr = region; > - devres_add(dev, ptr); > - } > - > - return region; > -} > -EXPORT_SYMBOL_GPL(devm_fpga_region_create); > - > -/** > - * fpga_region_register - register a FPGA region > - * @region: FPGA region > - * > - * Return: 0 or -errno > - */ > -int fpga_region_register(struct fpga_region *region) > -{ > - return device_add(®ion->dev); > + return ERR_PTR(ret); > } > EXPORT_SYMBOL_GPL(fpga_region_register); > > @@ -316,6 +249,10 @@ EXPORT_SYMBOL_GPL(fpga_region_unregister); > > static void fpga_region_dev_release(struct device *dev) > { > + struct fpga_region *region = to_fpga_region(dev); > + > + ida_simple_remove(&fpga_region_ida, region->dev.id); > + kfree(region); > } > > /** > diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c > index e405309baadc..466e083654ae 100644 > --- a/drivers/fpga/of-fpga-region.c > +++ b/drivers/fpga/of-fpga-region.c > @@ -405,16 +405,12 @@ static int of_fpga_region_probe(struct platform_device *pdev) > if (IS_ERR(mgr)) > return -EPROBE_DEFER; > > - region = devm_fpga_region_create(dev, mgr, of_fpga_region_get_bridges); > - if (!region) { > - ret = -ENOMEM; > + region = fpga_region_register(dev, mgr, of_fpga_region_get_bridges); > + if (IS_ERR(region)) { > + ret = PTR_ERR(region); > goto eprobe_mgr_put; > } > > - ret = fpga_region_register(region); > - if (ret) > - goto eprobe_mgr_put; > - > of_platform_populate(np, fpga_region_of_match, NULL, ®ion->dev); > platform_set_drvdata(pdev, region); > > diff --git a/include/linux/fpga/fpga-region.h b/include/linux/fpga/fpga-region.h > index 27cb706275db..ca793f43af14 100644 > --- a/include/linux/fpga/fpga-region.h > +++ b/include/linux/fpga/fpga-region.h > @@ -37,15 +37,9 @@ struct fpga_region *fpga_region_class_find( > > int fpga_region_program_fpga(struct fpga_region *region); > > -struct fpga_region > -*fpga_region_create(struct device *dev, struct fpga_manager *mgr, > - int (*get_bridges)(struct fpga_region *)); > -void fpga_region_free(struct fpga_region *region); > -int fpga_region_register(struct fpga_region *region); > +struct fpga_region * > +fpga_region_register(struct device *dev, struct fpga_manager *mgr, > + int (*get_bridges)(struct fpga_region *)); > void fpga_region_unregister(struct fpga_region *region); > > -struct fpga_region > -*devm_fpga_region_create(struct device *dev, struct fpga_manager *mgr, > - int (*get_bridges)(struct fpga_region *)); > - > #endif /* _FPGA_REGION_H */ > -- > 2.25.1