linux-kernel - Re: [PATCH 1/2] sysfs: add sysfs_add_bin_file_to

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Date:   Mon, 20 Dec 2021 09:01:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Rafał Miłecki <zajec5@...il.com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Dan Williams <dan.j.williams@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH 1/2] sysfs: add sysfs_add_bin_file_to_group()

On Mon, Dec 20, 2021 at 07:47:29AM +0100, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> There already is sysfs_add_file_to_group() for adding "attribute" to a
> group. This new function allows adding "bin_attribute" as well.
> 
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> ---
>  fs/sysfs/file.c       | 31 +++++++++++++++++++++++++++----
>  include/linux/sysfs.h |  3 +++
>  2 files changed, 30 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
> index 42dcf96881b6..30c798c38d89 100644
> --- a/fs/sysfs/file.c
> +++ b/fs/sysfs/file.c
> @@ -376,14 +376,19 @@ EXPORT_SYMBOL_GPL(sysfs_create_files);
>   * @attr: attribute descriptor.
>   * @group: group name.
>   */
> -int sysfs_add_file_to_group(struct kobject *kobj,
> -		const struct attribute *attr, const char *group)
> +int __sysfs_add_file_to_group(struct kobject *kobj,
> +			      const struct attribute *attr,
> +			      const struct bin_attribute *battr,
> +			      const char *group)
>  {
>  	struct kernfs_node *parent;
>  	kuid_t uid;
>  	kgid_t gid;
>  	int error;
>  
> +	if (WARN_ON((attr && battr) || (!attr && !battr)))
> +		return -EINVAL;

How can this ever happen?