[PATCH v2] drivers: gpu: amd: Initialize amdgpu_dm_backlight_caps object to 0 in amdgpu_dm_update_backlight_caps

[Christian König]

Am 20.08.20 um 09:52 schrieb Furquan Shaikh:
> In `amdgpu_dm_update_backlight_caps()`, there is a local
> `amdgpu_dm_backlight_caps` object that is filled in by
> `amdgpu_acpi_get_backlight_caps()`. However, this object is
> uninitialized before the call and hence the subsequent check for
> aux_support can fail since it is not initialized by
> `amdgpu_acpi_get_backlight_caps()` as well. This change initializes
> this local `amdgpu_dm_backlight_caps` object to 0.
>
> Signed-off-by: Furquan Shaikh <furquan at google.com>

Reviewed-by: Christian König <christian.koenig at amd.com>

> ---
> v2: Switched to using memset for initialization of object.
>
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index e4b33c67b634..da072998ce48 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -2855,6 +2855,8 @@ static void amdgpu_dm_update_backlight_caps(struct amdgpu_display_manager *dm)
>   #if defined(CONFIG_ACPI)
>   	struct amdgpu_dm_backlight_caps caps;
>   
> +	memset(&caps, 0, sizeof(caps));
> +
>   	if (dm->backlight_caps.caps_valid)
>   		return;
>