Re: [PATCH v2 5/5] ACPI: Drop parent field from struct acpi_device

[Hanjun Guo <guohanjun@huawei.com>]

Hi Rafael,

On 2022/8/25 0:59, Rafael J. Wysocki wrote:
> Index: linux-pm/include/acpi/acpi_bus.h
> ===================================================================
> --- linux-pm.orig/include/acpi/acpi_bus.h
> +++ linux-pm/include/acpi/acpi_bus.h
> @@ -365,7 +365,6 @@ struct acpi_device {
>   	int device_type;
>   	acpi_handle handle;		/* no handle for fixed hardware */
>   	struct fwnode_handle fwnode;
> -	struct acpi_device *parent;
>   	struct list_head wakeup_list;
>   	struct list_head del_list;
>   	struct acpi_device_status status;
> @@ -458,6 +457,14 @@ static inline void *acpi_driver_data(str
>   #define to_acpi_device(d)	container_of(d, struct acpi_device, dev)
>   #define to_acpi_driver(d)	container_of(d, struct acpi_driver, drv)
>   
> +static inline struct acpi_device *acpi_dev_parent(struct acpi_device *adev)
> +{
> +	if (adev->dev.parent)
> +		return to_acpi_device(adev->dev.parent);
> +
> +	return NULL;
> +}
> +
>   static inline void acpi_set_device_status(struct acpi_device *adev, u32 sta)
>   {
>   	*((u32 *)&adev->status) = sta;
> @@ -478,6 +485,7 @@ void acpi_initialize_hp_context(struct a
>   /* acpi_device.dev.bus == &acpi_bus_type */
>   extern struct bus_type acpi_bus_type;
>   
> +struct acpi_device *acpi_dev_parent(struct acpi_device *adev);

We have a static inline function above, is it duplicated here?
Or did I miss some use cases?

Thanks
Hanjun