On Mon, May 24, 2021 at 11:50:48AM -0700, Russ Weight wrote:
> The FPGA bridge 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 <russell.h.weight@xxxxxxxxx>
> ---
> v3:
> - Cleaned up comment header for fpga_bridge_register()
> - Fix error return values for fpga_bridge_register()
> v2:
> - No changes
> ---
> 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 | 119 ++++++----------------------
> drivers/fpga/xilinx-pr-decoupler.c | 17 ++--
> include/linux/fpga/fpga-bridge.h | 12 +--
> 7 files changed, 52 insertions(+), 140 deletions(-)
>
> diff --git a/drivers/fpga/altera-fpga2sdram.c b/drivers/fpga/altera-fpga2sdram.c
> index a78e49c63c64..66063507116b 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(mgr);
>
> 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 e9266b2a357f..54a08a682e89 100644
> --- a/drivers/fpga/fpga-bridge.c
> +++ b/drivers/fpga/fpga-bridge.c
> @@ -312,36 +312,35 @@ 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 a FPGA Bridge device
> * @dev: 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
> + * Returns a struct fpga_bridge pointer on success, or ERR_PTR() on error.
> */
> -struct fpga_bridge *fpga_bridge_create(struct device *dev, const char *name,
> - const struct fpga_bridge_ops *br_ops,
> - void *priv)
> +struct fpga_bridge *fpga_bridge_register(struct device *dev, const char *name,
> + const struct fpga_bridge_ops *br_ops,
> + void *priv)
> {
> struct fpga_bridge *bridge;
> int id, ret;
>
> if (!name || !strlen(name)) {
> dev_err(dev, "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);
> @@ -350,7 +349,6 @@ struct fpga_bridge *fpga_bridge_create(struct device *dev, 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 = dev;
> @@ -361,6 +359,16 @@ struct fpga_bridge *fpga_bridge_create(struct device *dev, const char *name,
> if (ret)
> goto error_device;
>
> + ret = device_register(&bridge->dev);
> + if (ret) {
> + put_device(&bridge->dev);
> + return ERR_PTR(ret);
> + }
> +
> + of_platform_populate(dev->of_node, NULL, NULL, dev);
> +
> + dev_info(dev->parent, "fpga bridge [%s] registered\n", bridge->name);
> +
> return bridge;
>
> error_device:
> @@ -368,88 +376,7 @@ struct fpga_bridge *fpga_bridge_create(struct device *dev, 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
> - * @dev: 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 *dev, 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(dev, name, br_ops, priv);
> - if (!bridge) {
> - devres_free(ptr);
> - } else {
> - *ptr = bridge;
> - devres_add(dev, 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 +402,10 @@ 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 ea2bde6e5bc4..c004e52b9464 100644
> --- a/drivers/fpga/xilinx-pr-decoupler.c
> +++ b/drivers/fpga/xilinx-pr-decoupler.c
> @@ -138,22 +138,17 @@ static int xlnx_pr_decoupler_probe(struct platform_device *pdev)
>
> clk_disable(priv->clk);
>
> - br = devm_fpga_bridge_create(&pdev->dev, priv->ipconfig->name,
> - &xlnx_pr_decoupler_br_ops, priv);
> - if (!br) {
> - err = -ENOMEM;
> - goto err_clk;
> - }
> -
> - platform_set_drvdata(pdev, br);
> -
> - err = fpga_bridge_register(br);
> - if (err) {
> + br = fpga_bridge_register(&pdev->dev, priv->ipconfig->name,
> + &xlnx_pr_decoupler_br_ops, priv);
> + if (IS_ERR(br)) {
> + err = PTR_ERR(br);
> dev_err(&pdev->dev, "unable to register %s",
> priv->ipconfig->name);
> goto err_clk;
> }
>
> + platform_set_drvdata(pdev, br);
> +
> return 0;
>
> err_clk:
> diff --git a/include/linux/fpga/fpga-bridge.h b/include/linux/fpga/fpga-bridge.h
> index 817600a32c93..86f306c99fa5 100644
> --- a/include/linux/fpga/fpga-bridge.h
> +++ b/include/linux/fpga/fpga-bridge.h
> @@ -62,15 +62,9 @@ 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 *dev, 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 */
Looks good to me.
Thanks,
Yilun
> --
> 2.25.1
