From: Nathan Chancellor <natechancellor@gmail.com>
To: "Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
"David (ChunMing) Zhou" <David1.Zhou@amd.com>,
"Harry Wentland" <harry.wentland@amd.com>,
"Leo Li" <sunpeng.li@amd.com>, "Rex Zhu" <rex.zhu@amd.com>,
"Evan Quan" <evan.quan@amd.com>
Cc: David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com,
Nathan Chancellor <natechancellor@gmail.com>
Subject: [PATCH 7/7] drm/amd/powerplay: Zero initialize current_rpm in vega20_get_fan_speed_percent
Date: Wed, 3 Jul 2019 22:52:18 -0700 [thread overview]
Message-ID: <20190704055217.45860-8-natechancellor@gmail.com> (raw)
In-Reply-To: <20190704055217.45860-1-natechancellor@gmail.com>
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>
---
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 e62dd6919b24..e37b39987587 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);
--
2.22.0
next prev parent reply other threads:[~2019-07-04 5:53 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-04 5:52 [PATCH 0/7] amdgpu clang warning fixes on next-20190703 Nathan Chancellor
2019-07-04 5:52 ` [PATCH 1/7] drm/amdgpu/mes10.1: Fix header guard Nathan Chancellor
2019-07-08 20:24 ` Arnd Bergmann
2019-07-04 5:52 ` [PATCH 2/7] drm/amd/powerplay: Use memset to initialize metrics structs Nathan Chancellor
2019-07-04 5:52 ` [PATCH 3/7] drm/amd/powerplay: Use proper enums in smu_adjust_power_state_dynamic Nathan Chancellor
2019-07-04 5:52 ` [PATCH 4/7] drm/amd/powerplay: Zero initialize freq in smu_v11_0_get_current_clk_freq Nathan Chancellor
2019-07-04 5:52 ` [PATCH 5/7] drm/amd/display: Use proper enum conversion functions Nathan Chancellor
2019-07-09 18:51 ` Arnd Bergmann
2019-07-09 20:21 ` Nathan Chancellor
2019-07-19 3:16 ` Nathan Chancellor
2019-07-25 16:00 ` Li, Sun peng (Leo)
2019-07-25 16:14 ` Kazlauskas, Nicholas
2019-07-25 17:26 ` Li, Sun peng (Leo)
2019-07-04 5:52 ` [PATCH 6/7] drm/amd/powerplay: Use proper enums in vega20_print_clk_levels Nathan Chancellor
2019-07-15 9:25 ` Arnd Bergmann
2019-07-15 15:39 ` Nathan Chancellor
2019-07-16 1:00 ` Quan, Evan
2019-07-04 5:52 ` Nathan Chancellor [this message]
2019-07-08 15:55 ` [PATCH 0/7] amdgpu clang warning fixes on next-20190703 Alex Deucher
2019-07-09 7:22 ` Nathan Chancellor
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