Patch "ACPI / video: skip evaluating _DOD when it does not exist" has been added to the 4.4-stable tree

Patch "ACPI / video: skip evaluating _DOD when it does not exist" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    ACPI / video: skip evaluating _DOD when it does not exist

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     acpi-video-skip-evaluating-_dod-when-it-does-not-exist.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From e34fbbac669de0b7fb7803929d0477f35f6e2833 Mon Sep 17 00:00:00 2001
From: Alex Hung <alex.hung@canonical.com>
Date: Fri, 27 May 2016 15:47:06 +0800
Subject: ACPI / video: skip evaluating _DOD when it does not exist

From: Alex Hung <alex.hung@canonical.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@canonical.com>
Reviewed-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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"));


Patches currently in stable-queue which might be from alex.hung@canonical.com are

queue-4.4/acpi-video-skip-evaluating-_dod-when-it-does-not-exist.patch