[PATCH openEuler-22.03-LTS-SP1 2/5] fpga: bridge: Use standard dev_release for class driver

From: Russ Weight russell.h.weight@intel.com

mainline inclusion from mainline-v5.17-rc1 commit 0d70af3c2530a70f1b2c197feaa63fbd3548ce34 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA7YMH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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The FPGA bridge 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.

Signed-off-by: Russ Weight russell.h.weight@intel.com Reviewed-by: Xu Yilun yilun.xu@intel.com Acked-by: Xu Yilun yilun.xu@intel.com Signed-off-by: Moritz Fischer mdf@kernel.org

Conflicts: Documentation/driver-api/fpga/fpga-bridge.rst drivers/fpga/fpga-bridge.c drivers/fpga/xilinx-pr-decoupler.c Signed-off-by: Ma Wupeng mawupeng1@huawei.com --- Documentation/driver-api/fpga/fpga-bridge.rst | 6 +- drivers/fpga/altera-fpga2sdram.c | 12 +- drivers/fpga/altera-freeze-bridge.c | 10 +- drivers/fpga/altera-hps2fpga.c | 12 +- drivers/fpga/dfl-fme-br.c | 10 +- drivers/fpga/fpga-bridge.c | 122 ++++-------------- drivers/fpga/xilinx-pr-decoupler.c | 13 +- include/linux/fpga/fpga-bridge.h | 30 +++-- 8 files changed, 72 insertions(+), 143 deletions(-)

diff --git a/Documentation/driver-api/fpga/fpga-bridge.rst b/Documentation/driver-api/fpga/fpga-bridge.rst index 198aadafd3e7..627cf372f412 100644 --- a/Documentation/driver-api/fpga/fpga-bridge.rst +++ b/Documentation/driver-api/fpga/fpga-bridge.rst @@ -6,8 +6,7 @@ API to implement a new FPGA bridge

* struct fpga_bridge — The FPGA Bridge structure * struct fpga_bridge_ops — Low level Bridge driver ops -* devm_fpga_bridge_create() — Allocate and init a bridge struct -* fpga_bridge_register() — Register a bridge +* fpga_bridge_register() — Create and register a bridge * fpga_bridge_unregister() — Unregister a bridge

.. kernel-doc:: include/linux/fpga/fpga-bridge.h @@ -16,9 +15,6 @@ API to implement a new FPGA bridge .. kernel-doc:: include/linux/fpga/fpga-bridge.h :functions: fpga_bridge_ops

-.. kernel-doc:: drivers/fpga/fpga-bridge.c - :functions: devm_fpga_bridge_create - .. kernel-doc:: drivers/fpga/fpga-bridge.c :functions: fpga_bridge_register

diff --git a/drivers/fpga/altera-fpga2sdram.c b/drivers/fpga/altera-fpga2sdram.c index a78e49c63c64..ff3a646fd9e3 100644 --- a/drivers/fpga/altera-fpga2sdram.c +++ b/drivers/fpga/altera-fpga2sdram.c @@ -121,17 +121,13 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev) /* Get f2s bridge configuration saved in handoff register */ regmap_read(sysmgr, SYSMGR_ISWGRP_HANDOFF3, &priv->mask);

- br = devm_fpga_bridge_create(dev, F2S_BRIDGE_NAME, - &altera_fpga2sdram_br_ops, priv); - if (!br) - return -ENOMEM; + br = fpga_bridge_register(dev, F2S_BRIDGE_NAME, + &altera_fpga2sdram_br_ops, priv); + if (IS_ERR(br)) + return PTR_ERR(br);

platform_set_drvdata(pdev, br);

- ret = fpga_bridge_register(br); - if (ret) - return ret; - dev_info(dev, "driver initialized with handoff %08x\n", priv->mask);

if (!of_property_read_u32(dev->of_node, "bridge-enable", &enable)) { diff --git a/drivers/fpga/altera-freeze-bridge.c b/drivers/fpga/altera-freeze-bridge.c index dd58c4aea92e..bfbfa43cd05b 100644 --- a/drivers/fpga/altera-freeze-bridge.c +++ b/drivers/fpga/altera-freeze-bridge.c @@ -244,14 +244,14 @@ static int altera_freeze_br_probe(struct platform_device *pdev)

priv->base_addr = base_addr;

- br = devm_fpga_bridge_create(dev, FREEZE_BRIDGE_NAME, - &altera_freeze_br_br_ops, priv); - if (!br) - return -ENOMEM; + br = fpga_bridge_register(dev, FREEZE_BRIDGE_NAME, + &altera_freeze_br_br_ops, priv); + if (IS_ERR(br)) + return PTR_ERR(br);

platform_set_drvdata(pdev, br);

- return fpga_bridge_register(br); + return 0; }

static int altera_freeze_br_remove(struct platform_device *pdev) diff --git a/drivers/fpga/altera-hps2fpga.c b/drivers/fpga/altera-hps2fpga.c index 77b95f251821..aa758426c22b 100644 --- a/drivers/fpga/altera-hps2fpga.c +++ b/drivers/fpga/altera-hps2fpga.c @@ -180,19 +180,15 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev) } }

- br = devm_fpga_bridge_create(dev, priv->name, - &altera_hps2fpga_br_ops, priv); - if (!br) { - ret = -ENOMEM; + br = fpga_bridge_register(dev, priv->name, + &altera_hps2fpga_br_ops, priv); + if (IS_ERR(br)) { + ret = PTR_ERR(br); goto err; }

platform_set_drvdata(pdev, br);

- ret = fpga_bridge_register(br); - if (ret) - goto err; - return 0;

err: diff --git a/drivers/fpga/dfl-fme-br.c b/drivers/fpga/dfl-fme-br.c index 3ff9f3a687ce..808d1f4d76df 100644 --- a/drivers/fpga/dfl-fme-br.c +++ b/drivers/fpga/dfl-fme-br.c @@ -68,14 +68,14 @@ static int fme_br_probe(struct platform_device *pdev)

priv->pdata = dev_get_platdata(dev);

- br = devm_fpga_bridge_create(dev, "DFL FPGA FME Bridge", - &fme_bridge_ops, priv); - if (!br) - return -ENOMEM; + br = fpga_bridge_register(dev, "DFL FPGA FME Bridge", + &fme_bridge_ops, priv); + if (IS_ERR(br)) + return PTR_ERR(br);

platform_set_drvdata(pdev, br);

- return fpga_bridge_register(br); + return 0; }

static int fme_br_remove(struct platform_device *pdev) diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c index db560e7cb350..44dba8095dd8 100644 --- a/drivers/fpga/fpga-bridge.c +++ b/drivers/fpga/fpga-bridge.c @@ -312,36 +312,41 @@ static struct attribute *fpga_bridge_attrs[] = { ATTRIBUTE_GROUPS(fpga_bridge);

/** - * fpga_bridge_create - create and initialize a struct fpga_bridge + * fpga_bridge_register - create and register an FPGA Bridge device * @parent: FPGA bridge device from pdev * @name: FPGA bridge name * @br_ops: pointer to structure of fpga bridge ops * @priv: FPGA bridge private data * - * The caller of this function is responsible for freeing the bridge with - * fpga_bridge_free(). Using devm_fpga_bridge_create() instead is recommended. - * - * Return: struct fpga_bridge or NULL + * Return: struct fpga_bridge pointer or ERR_PTR() */ -struct fpga_bridge *fpga_bridge_create(struct device *parent, const char *name, - const struct fpga_bridge_ops *br_ops, - void *priv) +struct fpga_bridge * +fpga_bridge_register(struct device *parent, const char *name, + const struct fpga_bridge_ops *br_ops, + void *priv) { struct fpga_bridge *bridge; int id, ret;

+ if (!br_ops) { + dev_err(parent, "Attempt to register without fpga_bridge_ops\n"); + return ERR_PTR(-EINVAL); + } + if (!name || !strlen(name)) { dev_err(parent, "Attempt to register with no name!\n"); - return NULL; + return ERR_PTR(-EINVAL); }

bridge = kzalloc(sizeof(*bridge), GFP_KERNEL); if (!bridge) - return NULL; + return ERR_PTR(-ENOMEM);

id = ida_simple_get(&fpga_bridge_ida, 0, 0, GFP_KERNEL); - if (id < 0) + if (id < 0) { + ret = id; goto error_kfree; + }

mutex_init(&bridge->mutex); INIT_LIST_HEAD(&bridge->node); @@ -350,17 +355,23 @@ struct fpga_bridge *fpga_bridge_create(struct device *parent, const char *name, bridge->br_ops = br_ops; bridge->priv = priv;

- device_initialize(&bridge->dev); bridge->dev.groups = br_ops->groups; bridge->dev.class = fpga_bridge_class; bridge->dev.parent = parent; bridge->dev.of_node = parent->of_node; bridge->dev.id = id; + of_platform_populate(bridge->dev.of_node, NULL, NULL, &bridge->dev);

ret = dev_set_name(&bridge->dev, "br%d", id); if (ret) goto error_device;

+ ret = device_register(&bridge->dev); + if (ret) { + put_device(&bridge->dev); + return ERR_PTR(ret); + } + return bridge;

error_device: @@ -368,88 +379,7 @@ struct fpga_bridge *fpga_bridge_create(struct device *parent, const char *name, error_kfree: kfree(bridge);

- return NULL; -} -EXPORT_SYMBOL_GPL(fpga_bridge_create); - -/** - * fpga_bridge_free - free a fpga bridge created by fpga_bridge_create() - * @bridge: FPGA bridge struct - */ -void fpga_bridge_free(struct fpga_bridge *bridge) -{ - ida_simple_remove(&fpga_bridge_ida, bridge->dev.id); - kfree(bridge); -} -EXPORT_SYMBOL_GPL(fpga_bridge_free); - -static void devm_fpga_bridge_release(struct device *dev, void *res) -{ - struct fpga_bridge *bridge = *(struct fpga_bridge **)res; - - fpga_bridge_free(bridge); -} - -/** - * devm_fpga_bridge_create - create and init a managed struct fpga_bridge - * @parent: FPGA bridge device from pdev - * @name: FPGA bridge name - * @br_ops: pointer to structure of fpga bridge ops - * @priv: FPGA bridge private data - * - * This function is intended for use in a FPGA bridge driver's probe function. - * After the bridge driver creates the struct with devm_fpga_bridge_create(), it - * should register the bridge with fpga_bridge_register(). The bridge driver's - * remove function should call fpga_bridge_unregister(). The bridge 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_bridge_register(), the struct will still get cleaned up. - * - * Return: struct fpga_bridge or NULL - */ -struct fpga_bridge -*devm_fpga_bridge_create(struct device *parent, const char *name, - const struct fpga_bridge_ops *br_ops, void *priv) -{ - struct fpga_bridge **ptr, *bridge; - - ptr = devres_alloc(devm_fpga_bridge_release, sizeof(*ptr), GFP_KERNEL); - if (!ptr) - return NULL; - - bridge = fpga_bridge_create(parent, name, br_ops, priv); - if (!bridge) { - devres_free(ptr); - } else { - *ptr = bridge; - devres_add(parent, ptr); - } - - return bridge; -} -EXPORT_SYMBOL_GPL(devm_fpga_bridge_create); - -/** - * fpga_bridge_register - register a FPGA bridge - * - * @bridge: FPGA bridge struct - * - * Return: 0 for success, error code otherwise. - */ -int fpga_bridge_register(struct fpga_bridge *bridge) -{ - struct device *dev = &bridge->dev; - int ret; - - ret = device_add(dev); - if (ret) - return ret; - - of_platform_populate(dev->of_node, NULL, NULL, dev); - - dev_info(dev->parent, "fpga bridge [%s] registered\n", bridge->name); - - return 0; + return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(fpga_bridge_register);

@@ -475,6 +405,10 @@ EXPORT_SYMBOL_GPL(fpga_bridge_unregister);

static void fpga_bridge_dev_release(struct device *dev) { + struct fpga_bridge *bridge = to_fpga_bridge(dev); + + ida_simple_remove(&fpga_bridge_ida, bridge->dev.id); + kfree(bridge); }

static int __init fpga_bridge_dev_init(void) diff --git a/drivers/fpga/xilinx-pr-decoupler.c b/drivers/fpga/xilinx-pr-decoupler.c index 7d69af230567..4a2bcb148d5d 100644 --- a/drivers/fpga/xilinx-pr-decoupler.c +++ b/drivers/fpga/xilinx-pr-decoupler.c @@ -114,21 +114,16 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev)

clk_disable(priv->clk);

- br = devm_fpga_bridge_create(&pdev->dev, "Xilinx PR Decoupler", + br = fpga_bridge_register(&pdev->dev, "Xilinx PR Decoupler", &xlnx_pr_decoupler_br_ops, priv); - if (!br) { - err = -ENOMEM; + if (IS_ERR(br)) { + err = PTR_ERR(br); + dev_err(&pdev->dev, "unable to register Xilinx PR Decoupler"); goto err_clk; }

platform_set_drvdata(pdev, br);

- err = fpga_bridge_register(br); - if (err) { - dev_err(&pdev->dev, "unable to register Xilinx PR Decoupler"); - goto err_clk; - } - return 0;

err_clk: diff --git a/include/linux/fpga/fpga-bridge.h b/include/linux/fpga/fpga-bridge.h index 817600a32c93..1c517b12300f 100644 --- a/include/linux/fpga/fpga-bridge.h +++ b/include/linux/fpga/fpga-bridge.h @@ -22,6 +22,23 @@ struct fpga_bridge_ops { const struct attribute_group **groups; };

+/** + * struct fpga_bridge_info - collection of parameters an FPGA Bridge + * @name: fpga bridge name + * @br_ops: pointer to structure of fpga bridge ops + * @priv: fpga bridge private data + * + * fpga_bridge_info contains parameters for the register function. These + * are separated into an info structure because they some are optional + * others could be added to in the future. The info structure facilitates + * maintaining a stable API. + */ +struct fpga_bridge_info { + const char *name; + const struct fpga_bridge_ops *br_ops; + void *priv; +}; + /** * struct fpga_bridge - FPGA bridge structure * @name: name of low level FPGA bridge @@ -62,15 +79,10 @@ int of_fpga_bridge_get_to_list(struct device_node *np, struct fpga_image_info *info, struct list_head *bridge_list);

-struct fpga_bridge *fpga_bridge_create(struct device *dev, const char *name, - const struct fpga_bridge_ops *br_ops, - void *priv); -void fpga_bridge_free(struct fpga_bridge *br); -int fpga_bridge_register(struct fpga_bridge *br); +struct fpga_bridge * +fpga_bridge_register(struct device *parent, const char *name, + const struct fpga_bridge_ops *br_ops, + void *priv); void fpga_bridge_unregister(struct fpga_bridge *br);

-struct fpga_bridge -*devm_fpga_bridge_create(struct device *dev, const char *name, - const struct fpga_bridge_ops *br_ops, void *priv); - #endif /* _LINUX_FPGA_BRIDGE_H */