linux-kernel - Re: [PATCH 7/6] driver core: add default groups to struct class

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Date:	Wed, 10 Jul 2013 15:18:12 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, oliver+list@...inagl.nl,
	khali@...ux-fr.org
Subject: Re: [PATCH 7/6] driver core: add default groups to struct class

On Wed, Jul 10, 2013 at 03:05:31PM -0700, Greg Kroah-Hartman wrote:
> 
> We should be using groups, not attribute lists, for classes to allow
> subdirectories, and soon, binary files.  Groups are just more flexible
> overall, so add them.
> 
> The dev_attrs list will go away after all in-kernel users are converted
> to use dev_groups.
> 
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Nice one ... that solves my problem.

Thanks!

Guenter

> ---
> Forgot this one in the series, it adds support to classes for groups, so
> that we can handle binary attributes properly for them as well.
> 
>  drivers/base/core.c    |    8 +++++++-
>  include/linux/device.h |    4 +++-
>  2 files changed, 10 insertions(+), 2 deletions(-)
> 
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -528,9 +528,12 @@ static int device_add_attrs(struct devic
>  	int error;
>  
>  	if (class) {
> -		error = device_add_attributes(dev, class->dev_attrs);
> +		error = device_add_groups(dev, class->dev_groups);
>  		if (error)
>  			return error;
> +		error = device_add_attributes(dev, class->dev_attrs);
> +		if (error)
> +			goto err_remove_class_groups;
>  		error = device_add_bin_attributes(dev, class->dev_bin_attrs);
>  		if (error)
>  			goto err_remove_class_attrs;
> @@ -563,6 +566,9 @@ static int device_add_attrs(struct devic
>   err_remove_class_attrs:
>  	if (class)
>  		device_remove_attributes(dev, class->dev_attrs);
> + err_remove_class_groups:
> +	if (class)
> +		device_remove_groups(dev, class->dev_groups);
>  
>  	return error;
>  }
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -313,6 +313,7 @@ int subsys_virtual_register(struct bus_t
>   * @name:	Name of the class.
>   * @owner:	The module owner.
>   * @class_attrs: Default attributes of this class.
> + * @dev_groups:	Default attributes of the devices that belong to the class.
>   * @dev_attrs:	Default attributes of the devices belong to the class.
>   * @dev_bin_attrs: Default binary attributes of the devices belong to the class.
>   * @dev_kobj:	The kobject that represents this class and links it into the hierarchy.
> @@ -342,7 +343,8 @@ struct class {
>  	struct module		*owner;
>  
>  	struct class_attribute		*class_attrs;
> -	struct device_attribute		*dev_attrs;
> +	struct device_attribute		*dev_attrs;	/* use dev_groups instead */
> +	const struct attribute_group	**dev_groups;
>  	struct bin_attribute		*dev_bin_attrs;
>  	struct kobject			*dev_kobj;
>  
> 
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