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SubjectRe: [PATCH v2] drivers: gpu: amd: Initialize amdgpu_dm_backlight_caps object to 0 in amdgpu_dm_update_backlight_caps
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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@google.com>

Reviewed-by: Christian König <christian.koenig@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;
>

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