linux-kernel - Re: [PATCH 3/5] driver core: class: add function to create /sys/class/<class>/foo directory

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Message-ID: <20190908130834.GB9466@kroah.com>
Date:   Sun, 8 Sep 2019 14:08:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Akinobu Mita <akinobu.mita@...il.com>
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>
Subject: Re: [PATCH 3/5] driver core: class: add function to create
 /sys/class/<class>/foo directory

On Sun, Sep 08, 2019 at 09:41:10PM +0900, Akinobu Mita wrote:
> This adds a new function class_kobject_create_and_add() that creates a
> directory in the /sys/class/<class>.
> 
> This function is required to create the /sys/class/leds/triggers directory
> that contains all available LED triggers.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Jacek Anaszewski <jacek.anaszewski@...il.com>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Dan Murphy <dmurphy@...com>
> Signed-off-by: Akinobu Mita <akinobu.mita@...il.com>
> ---
>  drivers/base/class.c   | 7 +++++++
>  include/linux/device.h | 3 +++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/base/class.c b/drivers/base/class.c
> index d8a6a58..f4c53e7 100644
> --- a/drivers/base/class.c
> +++ b/drivers/base/class.c
> @@ -104,6 +104,13 @@ void class_remove_file_ns(struct class *cls, const struct class_attribute *attr,
>  		sysfs_remove_file_ns(&cls->p->subsys.kobj, &attr->attr, ns);
>  }
>  
> +struct kobject *class_kobject_create_and_add(const char *name,
> +					     struct class *cls)
> +{
> +	return kobject_create_and_add(name, &cls->p->subsys.kobj);
> +}
> +EXPORT_SYMBOL_GPL(class_kobject_create_and_add);

Ick, why?  Are you _SURE_ you really need to do this?  Positive?  This
feels very strange...

greg k-h