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[75.142.250.213]) by smtp.gmail.com with ESMTPSA id s8sm756129otp.37.2021.07.09.11.46.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Jul 2021 11:46:51 -0700 (PDT) From: trix@redhat.com To: mdf@kernel.org, corbet@lwn.net, hao.wu@intel.com Cc: linux-fpga@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Russ Weight , Tom Rix , Xu Yilun Subject: [RFC PATCH v10 3/3] fpga: region: Use standard dev_release for class driver Date: Fri, 9 Jul 2021 11:46:48 -0700 Message-Id: <20210709184648.2521926-1-trix@redhat.com> X-Mailer: git-send-email 2.26.3 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Russ Weight The FPGA region class driver data structure is being treated as a managed resource instead of using the standard dev_release call-back function 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. The parameter 'void *priv' was added to register(). Signed-off-by: Russ Weight Signed-off-by: Tom Rix Reviewed-by: Xu Yilun --- Documentation/driver-api/fpga/fpga-region.rst | 4 - drivers/fpga/dfl-fme-region.c | 7 +- drivers/fpga/dfl.c | 12 +- drivers/fpga/fpga-region.c | 108 +++++------------- drivers/fpga/of-fpga-region.c | 10 +- include/linux/fpga/fpga-region.h | 12 +- 6 files changed, 38 insertions(+), 115 deletions(-) diff --git a/Documentation/driver-api/fpga/fpga-region.rst b/Documentation/driver-api/fpga/fpga-region.rst index 2f621de51130d..572729e49ec02 100644 --- a/Documentation/driver-api/fpga/fpga-region.rst +++ b/Documentation/driver-api/fpga/fpga-region.rst @@ -47,7 +47,6 @@ API to add a new FPGA region * struct fpga_region — The FPGA region struct * struct fpga_region_ops — Low level FPGA region driver ops -* devm_fpga_region_create() — Allocate and init a region struct * fpga_region_register() — Register an FPGA region * fpga_region_unregister() — Unregister an FPGA region @@ -79,9 +78,6 @@ following APIs to handle building or tearing down that list. .. kernel-doc:: include/linux/fpga/fpga-region.h :functions: fpga_region_ops -.. kernel-doc:: drivers/fpga/fpga-region.c - :functions: devm_fpga_region_create - .. kernel-doc:: drivers/fpga/fpga-region.c :functions: fpga_region_register diff --git a/drivers/fpga/dfl-fme-region.c b/drivers/fpga/dfl-fme-region.c index be1d57ee37666..13befbb4e1a6c 100644 --- a/drivers/fpga/dfl-fme-region.c +++ b/drivers/fpga/dfl-fme-region.c @@ -57,19 +57,14 @@ static int fme_region_probe(struct platform_device *pdev) if (IS_ERR(mgr)) return -EPROBE_DEFER; - region = devm_fpga_region_create(dev, mgr, &fme_fpga_region_ops); + region = fpga_region_register(dev, mgr, &fme_fpga_region_ops, pdata); if (!region) { ret = -ENOMEM; goto eprobe_mgr_put; } - region->priv = pdata; 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 511b20ff35a33..6e628c07c1dc1 100644 --- a/drivers/fpga/dfl.c +++ b/drivers/fpga/dfl.c @@ -1400,19 +1400,15 @@ 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; - goto free_cdev_exit; - } - cdev->parent = info->dev; mutex_init(&cdev->lock); INIT_LIST_HEAD(&cdev->port_dev_list); - ret = fpga_region_register(cdev->region); - if (ret) + cdev->region = fpga_region_register(info->dev, NULL, NULL, NULL); + if (IS_ERR(cdev->region)) { + ret = PTR_ERR(cdev->region); goto free_cdev_exit; + } /* create and init build info for enumeration */ binfo = devm_kzalloc(info->dev, sizeof(*binfo), GFP_KERNEL); diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c index b08d3914716f0..6442e80480b43 100644 --- a/drivers/fpga/fpga-region.c +++ b/drivers/fpga/fpga-region.c @@ -184,39 +184,44 @@ 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 an FPGA Region device * @parent: device parent * @mgr: manager that programs this region - * @rops: optional pointer to struct for fpga region ops + * @rops: optional pointer to struct for fpga region ops + * @priv: fpga region private data * * The caller of this function is responsible for freeing the resulting region - * struct with fpga_region_free(). Using devm_fpga_region_create() instead is + * struct with fpga_region_unregiser(). Using devm_fpga_region_create() instead is * recommended. * - * Return: struct fpga_region or NULL + * Return: struct fpga_region or ERR_PTR() */ -struct fpga_region -*fpga_region_create(struct device *parent, - struct fpga_manager *mgr, - const struct fpga_region_ops *rops) +struct fpga_region * +fpga_region_register(struct device *parent, + struct fpga_manager *mgr, + const struct fpga_region_ops *rops, + void *priv) { 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->rops = rops; + region->priv = priv; + mutex_init(®ion->mutex); INIT_LIST_HEAD(®ion->bridge_list); - device_initialize(®ion->dev); region->dev.class = fpga_region_class; region->dev.parent = parent; region->dev.of_node = parent->of_node; @@ -226,6 +231,12 @@ 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: @@ -233,76 +244,7 @@ struct fpga_region err_free: kfree(region); - return NULL; -} -EXPORT_SYMBOL_GPL(fpga_region_create); - -/** - * fpga_region_free - free an 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 - * @parent: device parent - * @mgr: manager that programs this region - * @rops: optional pointer to struct for fpga region ops - * - * This function is intended for use in an 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 *parent, - struct fpga_manager *mgr, - const struct fpga_region_ops *rops) -{ - struct fpga_region **ptr, *region; - - ptr = devres_alloc(devm_fpga_region_release, sizeof(*ptr), GFP_KERNEL); - if (!ptr) - return NULL; - - region = fpga_region_create(parent, mgr, rops); - if (!region) { - devres_free(ptr); - } else { - *ptr = region; - devres_add(parent, ptr); - } - - return region; -} -EXPORT_SYMBOL_GPL(devm_fpga_region_create); - -/** - * fpga_region_register - register an 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); @@ -320,6 +262,10 @@ 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 2c99605e008a6..bceb51b2476c6 100644 --- a/drivers/fpga/of-fpga-region.c +++ b/drivers/fpga/of-fpga-region.c @@ -409,16 +409,12 @@ 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_ops); - if (!region) { - ret = -ENOMEM; + region = fpga_region_register(dev, mgr, &of_fpga_region_ops, NULL); + 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 afc79784b2823..98f001625933f 100644 --- a/include/linux/fpga/fpga-region.h +++ b/include/linux/fpga/fpga-region.h @@ -51,15 +51,9 @@ 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, - const struct fpga_region_ops *rops); -void fpga_region_free(struct fpga_region *region); -int fpga_region_register(struct fpga_region *region); +struct fpga_region * +fpga_region_register(struct device *parent, struct fpga_manager *mgr, + const struct fpga_region_ops *rops, void *priv); void fpga_region_unregister(struct fpga_region *region); -struct fpga_region -*devm_fpga_region_create(struct device *dev, struct fpga_manager *mgr, - const struct fpga_region_ops *rops); - #endif /* _FPGA_REGION_H */ -- 2.26.3