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From 8ed86f7ce47aae9b2cc51c6360eb11e61458edb9 Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <natechancellor@gmail.com>
Date: Wed, 3 Jul 2019 22:52:15 -0700
Subject: [PATCH 2833/2940] drm/amd/powerplay: Zero initialize freq in
smu_v11_0_get_current_clk_freq
clang warns (trimmed for brevity):
drivers/gpu/drm/amd/amdgpu/../powerplay/smu_v11_0.c:1098:10: warning:
variable 'freq' is used uninitialized whenever '?:' condition is false
[-Wsometimes-uninitialized]
ret = smu_get_current_clk_freq_by_table(smu, clk_id, &freq);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If get_current_clk_freq_by_table is ever NULL, freq will fail to be
properly initialized. Zero initialize it to avoid using uninitialized
stack values.
smu_get_current_clk_freq_by_table expands to a ternary operator
conditional on smu->funcs->get_current_clk_freq_by_table being not NULL.
When this is false, freq will be uninitialized. Zero initialize freq to
avoid using random stack values if that ever happens.
Fixes: e36182490dec ("drm/amd/powerplay: fix dpm freq unit error (10KHz -> Mhz)")
Link: https://github.com/ClangBuiltLinux/linux/issues/585
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/powerplay/smu_v11_0.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
index e03088c693ec..c60899de88bb 100644
--- a/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
+++ b/drivers/gpu/drm/amd/powerplay/smu_v11_0.c
@@ -1090,7 +1090,7 @@ static int smu_v11_0_get_current_clk_freq(struct smu_context *smu,
uint32_t *value)
{
int ret = 0;
- uint32_t freq;
+ uint32_t freq = 0;
if (clk_id >= SMU_CLK_COUNT || !value)
return -EINVAL;
--
2.17.1
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