linux-kernel - Re: [PATCH v2 1/3] software node: Introduce device_add_software

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Message-ID: <2f552de5-4839-a1e5-3012-c56f9fa3bdd5@gmail.com>
Date:   Wed, 13 Jan 2021 00:40:03 +0000
From:   Daniel Scally <djrscally@...il.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Felipe Balbi <balbi@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 1/3] software node: Introduce
 device_add_software_node()

Hi Heikki

On 11/01/2021 14:10, Heikki Krogerus wrote:
> This helper will register a software node and then assign
> it to device at the same time. The function will also make
> sure that the device can't have more than one software node.
> 
> Tested-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> ---

I like this change. One comment below, but for what it's worth:

Reviewed-by: Daniel Scally <djrscally@...il.com>

> +/**
> + * device_remove_software_node - Remove device's software node
> + * @dev: The device with the software node.
> + *
> + * This function will unregister the software node of @dev.
> + */
> +void device_remove_software_node(struct device *dev)
> +{
> +	struct swnode *swnode;
> +
> +	swnode = dev_to_swnode(dev);
> +	if (!swnode)
> +		return;
> +
> +	kobject_put(&swnode->kobj);
> +}
> +EXPORT_SYMBOL_GPL(device_remove_software_node);

I wonder if this also ought to set dev_fwnode(dev)->secondary back to
ERR_PTR(-ENODEV)?

> +
>  int software_node_notify(struct device *dev, unsigned long action)
>  {
> -	struct fwnode_handle *fwnode = dev_fwnode(dev);
>  	struct swnode *swnode;
>  	int ret;
>  
> -	if (!fwnode)
> -		return 0;
> -
> -	if (!is_software_node(fwnode))
> -		fwnode = fwnode->secondary;
> -	if (!is_software_node(fwnode))
> +	swnode = dev_to_swnode(dev);
> +	if (!swnode)
>  		return 0;
>  
> -	swnode = to_swnode(fwnode);
> -
>  	switch (action) {
>  	case KOBJ_ADD:
>  		ret = sysfs_create_link(&dev->kobj, &swnode->kobj,
> diff --git a/include/linux/property.h b/include/linux/property.h
> index 0a9001fe7aeab..b0e413dc59271 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -488,4 +488,7 @@ fwnode_create_software_node(const struct property_entry *properties,
>  			    const struct fwnode_handle *parent);
>  void fwnode_remove_software_node(struct fwnode_handle *fwnode);
>  
> +int device_add_software_node(struct device *dev, const struct software_node *swnode);
> +void device_remove_software_node(struct device *dev);
> +
>  #endif /* _LINUX_PROPERTY_H_ */
>