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ACPI / property: Don't evaluate objects for devices w/o handle 

Fabricated devices such as LNXPWRBN lack a handle, causing evaluation
of _CCA and _DSD to always fail with AE_BAD_PARAMETER.  While that is
merely a (negligible) waste of processing power, evaluating a _DSM for
them (such as Apple's device properties _DSM which we're about to add)
results in an ugly error:

    ACPI: \: failed to evaluate _DSM (0x1001)

Avoid by not evaluating _DSD and the upcoming _DSM for devices without
handle.

Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lukas Wunner 2017-08-01 14:10:41 +02:00 committed by Rafael J. Wysocki
parent 630b3aff8a
commit 75fc70e073
1 changed files with 3 additions and 0 deletions
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3
drivers/acpi/property.c
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@ -339,6 +339,9 @@ void acpi_init_properties(struct acpi_device *adev)
INIT_LIST_HEAD(&adev->data.subnodes); INIT_LIST_HEAD(&adev->data.subnodes);
if (!adev->handle)
return;
/* /*
* Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in * Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in
* Device Tree compatible properties for this device. * Device Tree compatible properties for this device.