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    Subject[PATCH 3.10 191/268] ACPI / video: skip evaluating _DOD when it does not exist
    Date
    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: Jiri Slaby <jslaby@suse.cz>
    Signed-off-by: Willy Tarreau <w@1wt.eu>
    ---
    drivers/acpi/video.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
    index 0dc9ff6..e3ecaf4 100644
    --- a/drivers/acpi/video.c
    +++ b/drivers/acpi/video.c
    @@ -1263,6 +1263,9 @@ static int acpi_video_device_enumerate(struct acpi_video_bus *video)
    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"));
    --
    2.8.0.rc2.1.gbe9624a
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