Re: [PATCH] net: phy: core: make phy_class constant

[Vinod Koul]

On 05-03-24, 15:18, Ricardo B. Marliere wrote:
> Since commit 43a7206b0963 ("driver core: class: make class_register() take
> a const *"), the driver core allows for struct class to be in read-only
> memory, so move the phy_class structure to be declared at build time
> placing it into read-only memory, instead of having to be dynamically
> allocated at boot time.

why is this tagged net: ...??
This has nothing to do with networking!

> 
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Suggested-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Ricardo B. Marliere <ricardo@xxxxxxxxxxxx>
> ---
>  drivers/phy/phy-core.c | 26 +++++++++++++++-----------
>  1 file changed, 15 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
> index 7f9b4de772ee..5776d44fd32f 100644
> --- a/drivers/phy/phy-core.c
> +++ b/drivers/phy/phy-core.c
> @@ -20,7 +20,12 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/regulator/consumer.h>
>  
> -static struct class *phy_class;
> +static void phy_release(struct device *dev);
> +static const struct class phy_class = {
> +	.name = "phy",
> +	.dev_release = phy_release,
> +};
> +
>  static struct dentry *phy_debugfs_root;
>  static DEFINE_MUTEX(phy_provider_mutex);
>  static LIST_HEAD(phy_provider_list);
> @@ -706,7 +711,7 @@ struct phy *of_phy_simple_xlate(struct device *dev,
>  	struct phy *phy;
>  	struct class_dev_iter iter;
>  
> -	class_dev_iter_init(&iter, phy_class, NULL, NULL);
> +	class_dev_iter_init(&iter, &phy_class, NULL, NULL);
>  	while ((dev = class_dev_iter_next(&iter))) {
>  		phy = to_phy(dev);
>  		if (args->np != phy->dev.of_node)
> @@ -969,7 +974,7 @@ struct phy *phy_create(struct device *dev, struct device_node *node,
>  	device_initialize(&phy->dev);
>  	mutex_init(&phy->mutex);
>  
> -	phy->dev.class = phy_class;
> +	phy->dev.class = &phy_class;
>  	phy->dev.parent = dev;
>  	phy->dev.of_node = node ?: dev->of_node;
>  	phy->id = id;
> @@ -1238,14 +1243,13 @@ static void phy_release(struct device *dev)
>  
>  static int __init phy_core_init(void)
>  {
> -	phy_class = class_create("phy");
> -	if (IS_ERR(phy_class)) {
> -		pr_err("failed to create phy class --> %ld\n",
> -			PTR_ERR(phy_class));
> -		return PTR_ERR(phy_class);
> -	}
> +	int err;
>  
> -	phy_class->dev_release = phy_release;
> +	err = class_register(&phy_class);
> +	if (err) {
> +		pr_err("failed to register phy class");
> +		return err;
> +	}
>  
>  	phy_debugfs_root = debugfs_create_dir("phy", NULL);
>  
> @@ -1256,6 +1260,6 @@ device_initcall(phy_core_init);
>  static void __exit phy_core_exit(void)
>  {
>  	debugfs_remove_recursive(phy_debugfs_root);
> -	class_destroy(phy_class);
> +	class_unregister(&phy_class);
>  }
>  module_exit(phy_core_exit);
> 
> ---
> base-commit: 00ca8a15dafa990d391abc37f2b8256ddf909b35
> change-id: 20240305-class_cleanup-phy-668a148b2acd
> 
> Best regards,
> -- 
> Ricardo B. Marliere <ricardo@xxxxxxxxxxxx>

-- 
~Vinod