[PATCH] drm/amdgpu: Suppress keypresses from ACPI_VIDEO events

[PATCH] drm/amdgpu: Suppress keypresses from ACPI_VIDEO events

[Lyude Paul]

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
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
index 353993218f21..f008804f0b97 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
@@ -358,7 +358,9 @@ static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
  *
  * 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);
 
-- 
2.17.1

Re: [PATCH] drm/amdgpu: Suppress keypresses from ACPI_VIDEO events

[Alex Deucher]

On Fri, Sep 21, 2018 at 8:44 PM Lyude Paul <lyude@redhat.com> wrote:
>
> 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

Applied.  Thanks!  Sorry for the delay.

Alex

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> index 353993218f21..f008804f0b97 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> @@ -358,7 +358,9 @@ static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
>   *
>   * 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);
>
> --
> 2.17.1
>
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