linux-kernel - [PATCH 4.4 07/30] ACPI / video: skip evaluating

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Date:   Fri, 24 Mar 2017 18:58:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Alex Hung <alex.hung@...onical.com>,
        Aaron Lu <aaron.lu@...el.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: [PATCH 4.4 07/30] ACPI / video: skip evaluating _DOD when it does not exist

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Hung <alex.hung@...onical.com>

commit e34fbbac669de0b7fb7803929d0477f35f6e2833 upstream.

Some system supports hybrid graphics and its discrete VGA
does not have any connectors and therefore has no _DOD method.

Signed-off-by: Alex Hung <alex.hung@...onical.com>
Reviewed-by: Aaron Lu <aaron.lu@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/acpi/acpi_video.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/acpi/acpi_video.c
+++ b/drivers/acpi/acpi_video.c
@@ -1211,6 +1211,9 @@ static int acpi_video_device_enumerate(s
 	union acpi_object *dod = NULL;
 	union acpi_object *obj;
 
+	if (!video->cap._DOD)
+		return AE_NOT_EXIST;
+
 	status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
 	if (!ACPI_SUCCESS(status)) {
 		ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));