linux-kernel - [PATCH v4 2/5] ACPI / property: Don't evaluate objects for devices w/o handle

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Date:   Tue, 1 Aug 2017 14:10:41 +0200
From:   Lukas Wunner <lukas@...ner.de>
To:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc:     Ronald Tschalaer <ronald@...ovation.ch>,
        Federico Lorenzi <florenzi@...il.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Leif Liddy <leif.liddy@...il.com>,
        Daniel Roschka <danielroschka@...enitydawn.de>,
        Mark Brown <broonie@...nel.org>, linux-acpi@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/5] 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.

Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Lukas Wunner <lukas@...ner.de>
---
 drivers/acpi/property.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index a65c09cc223f..834e01bee015 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -338,6 +338,9 @@ void acpi_init_properties(struct acpi_device *adev)
 
 	INIT_LIST_HEAD(&adev->data.subnodes);
 
+	if (!adev->handle)
+		return;
+
 	/*
 	 * Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in
 	 * Device Tree compatible properties for this device.
-- 
2.11.0