linux-kernel - [PATCH][next] drm/amd/pp: fix logical or'ing of garbage in result by initializing result to zero

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Message-Id: <20180326141354.31247-1-colin.king@canonical.com>
Date:   Mon, 26 Mar 2018 15:13:54 +0100
From:   Colin King <colin.king@...onical.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>, Rex Zhu <Rex.Zhu@....com>,
        Evan Quan <evan.quan@....com>,
        Tom St Denis <tom.stdenis@....com>,
        Huang Rui <ray.huang@....com>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][next] drm/amd/pp: fix logical or'ing of garbage in result by initializing result to zero

From: Colin Ian King <colin.king@...onical.com>

Currently result is not initialized, so it contains a garbage value and
this is or'd with data from vega10_program_didt_config_registers() which
can end up with a non-zero value when the result should be zero.  Fix
this by ensuring result is initialized to zero.

Detected by CoverityScan, CID#1466088 ("Uninitialized scalar variable")

Fixes: 9b7b8154cdb8 ("drm/amd/powerplay: added didt support for vega10")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/vega10_powertune.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_powertune.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_powertune.c
index b1f74c7f0943..49822ea3ddd5 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_powertune.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_powertune.c
@@ -1091,7 +1091,7 @@ static int vega10_disable_se_edc_config(struct pp_hwmgr *hwmgr)
 
 static int vega10_enable_psm_gc_edc_config(struct pp_hwmgr *hwmgr)
 {
-	int result;
+	int result = 0;
 	uint32_t num_se = 0;
 	uint32_t count, data;
 	struct amdgpu_device *adev = hwmgr->adev;
-- 
2.15.1