From 985863d00a8feb597a38df38f8fc2f70e980156f Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <natechancellor@gmail.com>
Date: Wed, 3 Jul 2019 22:52:18 -0700
Subject: [PATCH] drm/amd/powerplay: Zero initialize current_rpm in
vega20_get_fan_speed_percent
clang warns (trimmed for brevity):
drivers/gpu/drm/amd/amdgpu/../powerplay/vega20_ppt.c:3023:8: warning:
variable 'current_rpm' is used uninitialized whenever '?:' condition is
false [-Wsometimes-uninitialized]
ret = smu_get_current_rpm(smu, ¤t_rpm);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
smu_get_current_rpm expands to a ternary operator conditional on
smu->funcs->get_current_rpm being not NULL. When this is false,
current_rpm will be uninitialized. Zero initialize current_rpm to
avoid using random stack values if that ever happens.
Fixes: ee0db82027ee ("drm/amd/powerplay: move PPTable_t uses into asic level")
Link: https://github.com/ClangBuiltLinux/linux/issues/588
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/powerplay/vega20_ppt.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c
index 0f14fe14ecd84..3d8938854aa7e 100644
--- a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c
+++ b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c
@@ -3016,8 +3016,7 @@ static int vega20_get_fan_speed_percent(struct smu_context *smu,
uint32_t *speed)
{
int ret = 0;
- uint32_t percent = 0;
- uint32_t current_rpm;
+ uint32_t current_rpm = 0, percent = 0;
PPTable_t *pptable = smu->smu_table.driver_pptable;
ret = smu_get_current_rpm(smu, ¤t_rpm);
--
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