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, &current_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>

diff --git a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c
index 0f14fe14ecd845d335b551477d33fea5d6d08bb2..3d8938854aa7ebcddec4b3dad9e3c815c4ce0eb5 100644 (file)
--- 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, &current_rpm);