drm/amdgpu: Suppress keypresses from ACPI_VIDEO events

commit 582f58de36834096a91cc1de2540c2f7269f850d upstream.

Currently we return NOTIFY_DONE for any event which we don't think is
ours. However, many laptops will send more then just an ATIF event and
will also send an ACPI_VIDEO_NOTIFY_PROBE event as well. Since we don't
check for this, we return NOTIFY_DONE which causes a keypress for the
ACPI event to be propogated to userspace. This is the equivalent of
someone pressing the display key on a laptop every time there's a
hotplug event.

So, check for ACPI_VIDEO_NOTIFY_PROBE events and suppress keypresses
from them.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 3539932..f008804 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -358,7 +358,9 @@ out:
  *
  * Checks the acpi event and if it matches an atif event,
  * handles it.
- * Returns NOTIFY code
+ *
+ * Returns:
+ * NOTIFY_BAD or NOTIFY_DONE, depending on the event.
  */
 static int amdgpu_atif_handler(struct amdgpu_device *adev,
                               struct acpi_bus_event *event)
@@ -372,11 +374,16 @@ static int amdgpu_atif_handler(struct amdgpu_device *adev,
        if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
                return NOTIFY_DONE;
 
+       /* Is this actually our event? */
        if (!atif ||
            !atif->notification_cfg.enabled ||
-           event->type != atif->notification_cfg.command_code)
-               /* Not our event */
-               return NOTIFY_DONE;
+           event->type != atif->notification_cfg.command_code) {
+               /* These events will generate keypresses otherwise */
+               if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
+                       return NOTIFY_BAD;
+               else
+                       return NOTIFY_DONE;
+       }
 
        if (atif->functions.sbios_requests) {
                struct atif_sbios_requests req;
@@ -385,7 +392,7 @@ static int amdgpu_atif_handler(struct amdgpu_device *adev,
                count = amdgpu_atif_get_sbios_requests(atif, &req);
 
                if (count <= 0)
-                       return NOTIFY_DONE;
+                       return NOTIFY_BAD;
 
                DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);