Re: [PATCH v1] ACPI: bus: Drop two fields from struct acpi_device_pnp

[Hans de Goede <hansg@kernel.org>]

Hi,

On 31-Aug-26 22:07, Rafael J. Wysocki wrote:
> From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
> 
> There are two fields in struct acpi_device_pnp, device_name and
> device_class, that were supposed to be populated and used by device
> drivers, but they have never been used consistently and now they
> are only set for the bus object in acpi_set_pnp_ids() (and never
> read afterward).
> 
> Drop them along with all of the associated symbols except for
> MAX_ACPI_CLASS_NAME_LEN and the acpi_device_class typedef that
> are used by the ACPI netlink messaging code.  Move those two
> definitions closer to the struct acpi_bus_event that refers to
> the acpi_device_class type.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Nice :)  Patch looks good to me:

Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>

Regards,

Hans



> ---
>  drivers/acpi/scan.c     |    4 ----
>  include/acpi/acpi_bus.h |   11 +++--------
>  2 files changed, 3 insertions(+), 12 deletions(-)
> 
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -28,9 +28,7 @@
>  #include "internal.h"
>  #include "sleep.h"
>  
> -#define ACPI_BUS_CLASS			"system_bus"
>  #define ACPI_BUS_HID			"LNXSYBUS"
> -#define ACPI_BUS_DEVICE_NAME		"System Bus"
>  
>  #define INVALID_ACPI_HANDLE	((acpi_handle)ZERO_PAGE(0))
>  
> @@ -1446,8 +1444,6 @@ static void acpi_set_pnp_ids(acpi_handle
>  			 acpi_object_is_system_bus(handle)) {
>  			/* \_SB, \_TZ, LNXSYBUS */
>  			acpi_add_id(pnp, ACPI_BUS_HID);
> -			strscpy(pnp->device_name, ACPI_BUS_DEVICE_NAME);
> -			strscpy(pnp->device_class, ACPI_BUS_CLASS);
>  		}
>  
>  		break;
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -206,12 +206,8 @@ struct acpi_device_dir {
>  
>  /* Plug and Play */
>  
> -#define MAX_ACPI_DEVICE_NAME_LEN	40
> -#define MAX_ACPI_CLASS_NAME_LEN		20
>  typedef char acpi_bus_id[8];
>  typedef u64 acpi_bus_address;
> -typedef char acpi_device_name[MAX_ACPI_DEVICE_NAME_LEN];
> -typedef char acpi_device_class[MAX_ACPI_CLASS_NAME_LEN];
>  
>  struct acpi_hardware_id {
>  	struct list_head list;
> @@ -233,16 +229,12 @@ struct acpi_device_pnp {
>  	acpi_bus_address bus_address;	/* _ADR */
>  	char *unique_id;		/* _UID */
>  	struct list_head ids;		/* _HID and _CIDs */
> -	acpi_device_name device_name;	/* Driver-determined */
> -	acpi_device_class device_class;	/*        "          */
>  };
>  
>  #define acpi_device_bid(d)	((d)->pnp.bus_id)
>  #define acpi_device_adr(d)	((d)->pnp.bus_address)
>  const char *acpi_device_hid(struct acpi_device *device);
>  #define acpi_device_uid(d)	((d)->pnp.unique_id)
> -#define acpi_device_name(d)	((d)->pnp.device_name)
> -#define acpi_device_class(d)	((d)->pnp.device_class)
>  
>  /* Power Management */
>  
> @@ -582,6 +574,9 @@ int acpi_dev_for_each_child_reverse(stru
>   * ------
>   */
>  
> +#define MAX_ACPI_CLASS_NAME_LEN		20
> +typedef char acpi_device_class[MAX_ACPI_CLASS_NAME_LEN];
> +
>  struct acpi_bus_event {
>  	struct list_head node;
>  	acpi_device_class device_class;
> 
> 
>