linux-kernel - Re: [PATCH v2 5/7] surface: surface3_power: Drop redundant acpi_bus_get

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Date:   Tue, 12 Oct 2021 21:40:21 +0200
From:   Maximilian Luz <luzmaximilian@...il.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v2 5/7] surface: surface3_power: Drop redundant
 acpi_bus_get_device() call

On 10/12/21 21:32, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael@...nel.org>
> 
> If the ACPI companion of a given device is not present, the result
> of the ACPI_HANDLE() evaluation for it will be NULL, so calling
> acpi_bus_get_device() on ACPI_HANDLE() result in order to validate
> it is redundant.
> 
> Drop the redundant acpi_bus_get_device() call from mshw0011_notify()
> along with a local variable related to it.
> 
> No intentional functional impact.
> 
> Signed-off-by: Rafael J. Wysocki <rafael@...nel.org>
> ---
> 
> v1 -> v2:
>     * Instead of switching over to using ACPI_COMPANION(), just drop the
>       redundant acpi_bus_get_device() call from mshw0011_notify() and
>       update the subject and changelog accordingly.
> 

Thanks, looks good to me!

Reviewed-by: Maximilian Luz <luzmaximilian@...il.com>

> ---
>   drivers/platform/surface/surface3_power.c |    3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
> 
> Index: linux-pm/drivers/platform/surface/surface3_power.c
> ===================================================================
> --- linux-pm.orig/drivers/platform/surface/surface3_power.c
> +++ linux-pm/drivers/platform/surface/surface3_power.c
> @@ -159,12 +159,11 @@ mshw0011_notify(struct mshw0011_data *cd
>   		unsigned int *ret_value)
>   {
>   	union acpi_object *obj;
> -	struct acpi_device *adev;
>   	acpi_handle handle;
>   	unsigned int i;
>   
>   	handle = ACPI_HANDLE(&cdata->adp1->dev);
> -	if (!handle || acpi_bus_get_device(handle, &adev))
> +	if (!handle)
>   		return -ENODEV;
>   
>   	obj = acpi_evaluate_dsm_typed(handle, &mshw0011_guid, arg1, arg2, NULL,
> 
> 
>