linux-kernel - [PATCH v2] drivers: gpu: amd: Initialize amdgpu_dm_backlight_caps object to 0 in amdgpu_dm_update_backlight

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Message-Id: <20200820075241.3160534-1-furquan@google.com>
Date:   Thu, 20 Aug 2020 00:52:41 -0700
From:   Furquan Shaikh <furquan@...gle.com>
To:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>
Cc:     "Christian König" <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>,
        Stylon Wang <stylon.wang@....com>, Roman Li <roman.li@....com>,
        Mikita Lipski <mikita.lipski@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, adurbin@...gle.com,
        deepak.sharma@....com, Furquan Shaikh <furquan@...gle.com>
Subject: [PATCH v2] drivers: gpu: amd: Initialize amdgpu_dm_backlight_caps
 object to 0 in amdgpu_dm_update_backlight_caps

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@...gle.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;
 
-- 
2.28.0.297.g1956fa8f8d-goog