linux-kernel - Re: [PATCH v3 5/7] surface: surface3_power: Drop redundant acpi_bus_get

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Date:   Tue, 19 Oct 2021 16:56:59 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Maximilian Luz <luzmaximilian@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Mark Gross <mgross@...ux.intel.com>,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v3 5/7] surface: surface3_power: Drop redundant
 acpi_bus_get_device() call

Hi,

On 10/13/21 18:12, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> 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.j.wysocki@...el.com>
> Reviewed-by: Maximilian Luz <luzmaximilian@...il.com>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans


> ---
> 
> v2 -> v3:
>    * Resend with a different From and S-o-b address and with R-by from
>      Maximilian.  No other changes.
> 
> ---
>  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,
> 
> 
>