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ACPI / scan: Clean up acpi_bus_get_parent()

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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@intel.com>
Acked-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Rafael J. Wysocki 2013-01-31 20:57:40 +01:00
parent 141a297bd0
commit 456de893ea
1 changed files with 5 additions and 11 deletions
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16
drivers/acpi/scan.c
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@ -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