linux-kernel - Re: [PATCH] ipmi: make ipmi_class a static const structure

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Date:   Tue, 20 Jun 2023 10:06:05 -0500
From:   Corey Minyard <minyard@....org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Ivan Orlov <ivan.orlov0322@...il.com>,
        openipmi-developer@...ts.sourceforge.net
Subject: Re: [PATCH] ipmi: make ipmi_class a static const structure

On Tue, Jun 20, 2023 at 04:37:02PM +0200, Greg Kroah-Hartman wrote:
> From: Ivan Orlov <ivan.orlov0322@...il.com>
> 
> Now that the driver core allows for struct class to be in read-only
> memory, move the ipmi_class structure to be declared at build time
> placing it into read-only memory, instead of having to be dynamically
> allocated at boot time.

This is in my next tree and seems to work fine.  Thanks.

-corey

> 
> Cc: Corey Minyard <minyard@....org>
> Cc: openipmi-developer@...ts.sourceforge.net
> Suggested-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Ivan Orlov <ivan.orlov0322@...il.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/char/ipmi/ipmi_devintf.c | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/char/ipmi/ipmi_devintf.c b/drivers/char/ipmi/ipmi_devintf.c
> index 73e5a9e28f85..332082e02ea5 100644
> --- a/drivers/char/ipmi/ipmi_devintf.c
> +++ b/drivers/char/ipmi/ipmi_devintf.c
> @@ -807,7 +807,9 @@ struct ipmi_reg_list {
>  static LIST_HEAD(reg_list);
>  static DEFINE_MUTEX(reg_list_mutex);
>  
> -static struct class *ipmi_class;
> +static const struct class ipmi_class = {
> +	.name = "ipmi",
> +};
>  
>  static void ipmi_new_smi(int if_num, struct device *device)
>  {
> @@ -822,7 +824,7 @@ static void ipmi_new_smi(int if_num, struct device *device)
>  	entry->dev = dev;
>  
>  	mutex_lock(&reg_list_mutex);
> -	device_create(ipmi_class, device, dev, NULL, "ipmi%d", if_num);
> +	device_create(&ipmi_class, device, dev, NULL, "ipmi%d", if_num);
>  	list_add(&entry->link, &reg_list);
>  	mutex_unlock(&reg_list_mutex);
>  }
> @@ -840,7 +842,7 @@ static void ipmi_smi_gone(int if_num)
>  			break;
>  		}
>  	}
> -	device_destroy(ipmi_class, dev);
> +	device_destroy(&ipmi_class, dev);
>  	mutex_unlock(&reg_list_mutex);
>  }
>  
> @@ -860,15 +862,13 @@ static int __init init_ipmi_devintf(void)
>  
>  	pr_info("ipmi device interface\n");
>  
> -	ipmi_class = class_create("ipmi");
> -	if (IS_ERR(ipmi_class)) {
> -		pr_err("ipmi: can't register device class\n");
> -		return PTR_ERR(ipmi_class);
> -	}
> +	rv = class_register(&ipmi_class);
> +	if (rv)
> +		return rv;
>  
>  	rv = register_chrdev(ipmi_major, DEVICE_NAME, &ipmi_fops);
>  	if (rv < 0) {
> -		class_destroy(ipmi_class);
> +		class_unregister(&ipmi_class);
>  		pr_err("ipmi: can't get major %d\n", ipmi_major);
>  		return rv;
>  	}
> @@ -880,7 +880,7 @@ static int __init init_ipmi_devintf(void)
>  	rv = ipmi_smi_watcher_register(&smi_watcher);
>  	if (rv) {
>  		unregister_chrdev(ipmi_major, DEVICE_NAME);
> -		class_destroy(ipmi_class);
> +		class_unregister(&ipmi_class);
>  		pr_warn("ipmi: can't register smi watcher\n");
>  		return rv;
>  	}
> @@ -895,11 +895,11 @@ static void __exit cleanup_ipmi(void)
>  	mutex_lock(&reg_list_mutex);
>  	list_for_each_entry_safe(entry, entry2, &reg_list, link) {
>  		list_del(&entry->link);
> -		device_destroy(ipmi_class, entry->dev);
> +		device_destroy(&ipmi_class, entry->dev);
>  		kfree(entry);
>  	}
>  	mutex_unlock(&reg_list_mutex);
> -	class_destroy(ipmi_class);
> +	class_unregister(&ipmi_class);
>  	ipmi_smi_watcher_unregister(&smi_watcher);
>  	unregister_chrdev(ipmi_major, DEVICE_NAME);
>  }
> -- 
> 2.41.0
>