[PATCH 5.8 031/186] drivers: gpu: amd: Initialize amdgpu_dm_backlight_caps object to 0 in amdgpu_dm_update_backlight_caps

From: Greg Kroah-Hartman
Date: Tue Sep 08 2020 - 15:13:24 EST

From: Furquan Shaikh <furquan@xxxxxxxxxx>

[ Upstream commit 5896585512e5156482335e902f7c7393b940da51 ]

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.

Reviewed-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Furquan Shaikh <furquan@xxxxxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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 666ebe04837af..7ec810ebf4ce4 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -2844,6 +2844,8 @@ 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)