linux-kernel - Re: [PATCH v1] ACPI: thermal: Do not attach private data to ACPI handles

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Date:   Wed, 9 Aug 2023 01:35:04 +0000
From:   "Zhang, Rui" <rui.zhang@...el.com>
To:     "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
CC:     "srinivas.pandruvada@...ux.intel.com" 
        <srinivas.pandruvada@...ux.intel.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] ACPI: thermal: Do not attach private data to ACPI
 handles

On Tue, 2023-08-08 at 22:15 +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> The ACPI thermal driver uses acpi_bus_attach_private_data() to attach
> the thermal zone object to the ACPI handle of the thermal zone and
> acpi_bus_detach_private_data() to clean that up, but it never uses
> acpi_bus_get_private_data() to retrieve that object.
> 
> Drop the unneded acpi_bus_attach_private_data() and
> acpi_bus_detach_private_data() calls from the ACPI thermal driver and
> clean up the related code.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

yeah, the attached private data is used by the intel_menlow driver, and
it is not needed any more after intel_menlow driver removed.

I have exactly the same patch that I planned to send after the thermal
trip point patches merged, so

Reviewed-by: Zhang Rui <rui.zhang@...el.com>

thanks,
rui

> ---
>  drivers/acpi/thermal.c |   13 +------------
>  1 file changed, 1 insertion(+), 12 deletions(-)
> 
> Index: linux-pm/drivers/acpi/thermal.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/thermal.c
> +++ linux-pm/drivers/acpi/thermal.c
> @@ -742,7 +742,6 @@ static int acpi_thermal_register_thermal
>  {
>         int trips = 0;
>         int result;
> -       acpi_status status;
>         int i;
>  
>         if (tz->trips.critical.valid)
> @@ -775,24 +774,15 @@ static int acpi_thermal_register_thermal
>         if (result)
>                 goto unregister_tzd;
>  
> -       status =  acpi_bus_attach_private_data(tz->device->handle,
> -                                              tz->thermal_zone);
> -       if (ACPI_FAILURE(status)) {
> -               result = -ENODEV;
> -               goto remove_links;
> -       }
> -
>         result = thermal_zone_device_enable(tz->thermal_zone);
>         if (result)
> -               goto acpi_bus_detach;
> +               goto remove_links;
>  
>         dev_info(&tz->device->dev, "registered as thermal_zone%d\n",
>                  thermal_zone_device_id(tz->thermal_zone));
>  
>         return 0;
>  
> -acpi_bus_detach:
> -       acpi_bus_detach_private_data(tz->device->handle);
>  remove_links:
>         acpi_thermal_zone_sysfs_remove(tz);
>  unregister_tzd:
> @@ -806,7 +796,6 @@ static void acpi_thermal_unregister_ther
>         acpi_thermal_zone_sysfs_remove(tz);
>         thermal_zone_device_unregister(tz->thermal_zone);
>         tz->thermal_zone = NULL;
> -       acpi_bus_detach_private_data(tz->device->handle);
>  }
>  
>  
> 
> 
>