linux-kernel - Re: [PATCH 2/2] ACPI / scan: Clean up acpi_bus_get

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Date:	Thu, 31 Jan 2013 12:41:30 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	Yinghai Lu <yinghai@...nel.org>, Toshi Kani <toshi.kani@...com>
Subject: Re: [PATCH 2/2] ACPI / scan: Clean up acpi_bus_get_parent()

2013/01/31 7:04, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> Make acpi_bus_get_parent() more straightforward and remove an
> unnecessary local variable ret from it.
>
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---

Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

>   drivers/acpi/scan.c |   16 +++++-----------
>   1 file changed, 5 insertions(+), 11 deletions(-)
>
> Index: test/drivers/acpi/scan.c
> ===================================================================
> --- test.orig/drivers/acpi/scan.c
> +++ test/drivers/acpi/scan.c
> @@ -871,29 +871,23 @@ EXPORT_SYMBOL(acpi_bus_unregister_driver
>      -------------------------------------------------------------------------- */
>   static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
>   {
> +	struct acpi_device *device = NULL;
>   	acpi_status status;
> -	int ret;
> -	struct acpi_device *device;
>
>   	/*
>   	 * Fixed hardware devices do not appear in the namespace and do not
>   	 * have handles, but we fabricate acpi_devices for them, so we have
>   	 * to deal with them specially.
>   	 */
> -	if (handle == NULL)
> +	if (!handle)
>   		return acpi_root;
>
>   	do {
>   		status = acpi_get_parent(handle, &handle);
> -		if (status == AE_NULL_ENTRY)
> -			return NULL;
>   		if (ACPI_FAILURE(status))
> -			return acpi_root;
> -
> -		ret = acpi_bus_get_device(handle, &device);
> -		if (ret == 0)
> -			return device;
> -	} while (1);
> +			return status == AE_NULL_ENTRY ? NULL : acpi_root;
> +	} while (acpi_bus_get_device(handle, &device));
> +	return device;
>   }
>
>   acpi_status
>
> --
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