Re: [PATCH] pps: change pps_class to a const struct

[Rodolfo Giometti <giometti@enneenne.com>]

On 3/2/26 16:11, Jori Koolstra wrote:
> The class_create() call has been deprecated in favor of class_register()
> as the driver core now allows for a struct class to be in read-only
> memory. Change pps_class to be a const struct class and drop the
> class_create() call.
> 
> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Jori Koolstra <jkoolstra@xs4all.nl>

Acked-by: Rodolfo Giometti <giometti@enneenne.com>

> ---
>   drivers/pps/pps.c | 24 ++++++++++++++----------
>   1 file changed, 14 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pps/pps.c b/drivers/pps/pps.c
> index c6b8b6478276..de1122bb69ea 100644
> --- a/drivers/pps/pps.c
> +++ b/drivers/pps/pps.c
> @@ -26,7 +26,10 @@
>    */
>   
>   static int pps_major;
> -static struct class *pps_class;
> +static const struct class pps_class = {
> +	.name		= "pps",
> +	.dev_groups	= pps_groups
> +};
>   
>   static DEFINE_MUTEX(pps_idr_lock);
>   static DEFINE_IDR(pps_idr);
> @@ -379,7 +382,7 @@ int pps_register_cdev(struct pps_device *pps)
>   	}
>   	pps->id = err;
>   
> -	pps->dev.class = pps_class;
> +	pps->dev.class = &pps_class;
>   	pps->dev.parent = pps->info.dev;
>   	pps->dev.devt = MKDEV(pps_major, pps->id);
>   	dev_set_drvdata(&pps->dev, pps);
> @@ -408,7 +411,7 @@ void pps_unregister_cdev(struct pps_device *pps)
>   {
>   	pr_debug("unregistering pps%d\n", pps->id);
>   	pps->lookup_cookie = NULL;
> -	device_destroy(pps_class, pps->dev.devt);
> +	device_destroy(&pps_class, pps->dev.devt);
>   
>   	/* Now we can release the ID for re-use */
>   	mutex_lock(&pps_idr_lock);
> @@ -460,18 +463,19 @@ EXPORT_SYMBOL(pps_lookup_dev);
>   
>   static void __exit pps_exit(void)
>   {
> -	class_destroy(pps_class);
> +	class_unregister(&pps_class);
>   	__unregister_chrdev(pps_major, 0, PPS_MAX_SOURCES, "pps");
>   }
>   
>   static int __init pps_init(void)
>   {
> -	pps_class = class_create("pps");
> -	if (IS_ERR(pps_class)) {
> -		pr_err("failed to allocate class\n");
> -		return PTR_ERR(pps_class);
> +	int err;
> +
> +	err = class_register(&pps_class);
> +	if (err) {
> +		pr_err("failed to register class\n");
> +		return err;
>   	}
> -	pps_class->dev_groups = pps_groups;
>   
>   	pps_major = __register_chrdev(0, 0, PPS_MAX_SOURCES, "pps",
>   				      &pps_cdev_fops);
> @@ -487,7 +491,7 @@ static int __init pps_init(void)
>   	return 0;
>   
>   remove_class:
> -	class_destroy(pps_class);
> +	class_unregister(&pps_class);
>   	return pps_major;
>   }
>   
> 
> base-commit: d466c332e106fe666d1e2f5a24d08e308bebbfa1


-- 
GNU/Linux Solutions                  e-mail: giometti@enneenne.com
Linux Device Driver                          giometti@linux.it
Embedded Systems                     phone:  +39 349 2432127
UNIX programming