linux-kernel - Re: [PATCH v1 2/5] ACPI: scan: Rename acpi_bus_get

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Date:   Fri, 12 Aug 2022 14:08:31 +0100
From:   Punit Agrawal <punit.agrawal@...edance.com>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Linux ACPI <linux-acpi@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Linux PM <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v1 2/5] ACPI: scan: Rename acpi_bus_get_parent() and
 rearrange it

"Rafael J. Wysocki" <rjw@...ysocki.net> writes:

> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> The acpi_bus_get_parent() name doesn't really reflect the
> purpose of the function so change it to a more accurate
> acpi_find_parent_acpi_dev().
>
> While at it, rearrange the code inside that function the make it

Typo:                                                  to

> easier to read.
>
> No intentional functional impact.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
>  drivers/acpi/scan.c |   24 ++++++++++++++----------
>  1 file changed, 14 insertions(+), 10 deletions(-)
>
> Index: linux-pm/drivers/acpi/scan.c
> ===================================================================
> --- linux-pm.orig/drivers/acpi/scan.c
> +++ linux-pm/drivers/acpi/scan.c
> @@ -816,10 +816,9 @@ static const char * const acpi_honor_dep
>  	NULL
>  };
>  
> -static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
> +static struct acpi_device *acpi_find_parent_acpi_dev(acpi_handle handle)
>  {
> -	struct acpi_device *device;
> -	acpi_status status;
> +	struct acpi_device *adev;
>  
>  	/*
>  	 * Fixed hardware devices do not appear in the namespace and do not
> @@ -830,13 +829,18 @@ static struct acpi_device *acpi_bus_get_
>  		return acpi_root;
>  
>  	do {
> -		status = acpi_get_parent(handle, &handle);
> -		if (ACPI_FAILURE(status))
> -			return status == AE_NULL_ENTRY ? NULL : acpi_root;
> +		acpi_status status;
>  
> -		device = acpi_fetch_acpi_dev(handle);
> -	} while (!device);
> -	return device;
> +		status = acpi_get_parent(handle, &handle);
> +		if (ACPI_FAILURE(status)) {
> +			if (status != AE_NULL_ENTRY)
> +				return acpi_root;
> +
> +			return NULL;
> +		}
> +		adev = acpi_fetch_acpi_dev(handle);
> +	} while (!adev);
> +	return adev;
>  }
>  
>  acpi_status
> @@ -1777,7 +1781,7 @@ void acpi_init_device_object(struct acpi
>  	INIT_LIST_HEAD(&device->pnp.ids);
>  	device->device_type = type;
>  	device->handle = handle;
> -	device->parent = acpi_bus_get_parent(handle);
> +	device->parent = acpi_find_parent_acpi_dev(handle);
>  	fwnode_init(&device->fwnode, &acpi_device_fwnode_ops);
>  	acpi_set_device_status(device, ACPI_STA_DEFAULT);
>  	acpi_device_get_busid(device);