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| author | Nathan Chancellor <natechancellor@gmail.com> | 2019-03-19 17:58:42 -0700 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2019-03-20 23:39:49 -0500 |
| commit | 5ea8b4725f42c22c37b370eebb5d33b4236f5301 (patch) | |
| tree | d19723df8a6b41fbaef67791c1151f503912d8a1 /drivers/gpu/drm/amd/powerplay/vega20_ppt.c | |
| parent | 5bbfcebb6d1bf322b5902e3c4b6b42a1f679fec3 (diff) | |
| download | linux-5ea8b4725f42c22c37b370eebb5d33b4236f5301.tar.bz2 | |
drm/amd/powerplay: Zero initialize num_of_levels in vega20_set_single_dpm_table
When building with -Wsometimes-uninitialized, Clang warns:
drivers/gpu/drm/amd/amdgpu/../powerplay/vega20_ppt.c:456:2: warning:
variable 'num_of_levels' is used uninitialized whenever '?:' condition
is false [-Wsometimes-uninitialized]
smu_read_smc_arg(smu, &num_of_levels);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../powerplay/inc/amdgpu_smu.h:608:3: note:
expanded from macro 'smu_read_smc_arg'
((smu)->funcs->read_smc_arg? (smu)->funcs->read_smc_arg((smu), (arg)) : 0)
^~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../powerplay/vega20_ppt.c:457:7: note:
uninitialized use occurs here
if (!num_of_levels) {
^~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../powerplay/vega20_ppt.c:456:2: note: remove
the '?:' if its condition is always true
smu_read_smc_arg(smu, &num_of_levels);
^
drivers/gpu/drm/amd/amdgpu/../powerplay/inc/amdgpu_smu.h:608:3: note:
expanded from macro 'smu_read_smc_arg'
((smu)->funcs->read_smc_arg? (smu)->funcs->read_smc_arg((smu), (arg)) : 0)
^
drivers/gpu/drm/amd/amdgpu/../powerplay/vega20_ppt.c:446:27: note:
initialize the variable 'num_of_levels' to silence this warning
uint32_t i, num_of_levels, clk;
^
= 0
1 warning generated.
The if statement it mentions as potentially problematic is currently
always true because the read_smc_arg callback is assigned at the
bottom of this file but Clang can't tell that. If the callback were
ever to disappear, num_of_levels would never be initialized. Just
zero initialize it to ensure that the intent behind this code
remains the same.
Link: https://github.com/ClangBuiltLinux/linux/issues/425
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/powerplay/vega20_ppt.c')
| -rw-r--r-- | drivers/gpu/drm/amd/powerplay/vega20_ppt.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c index 7e9e8ad9a300..41e6f49c9cb6 100644 --- a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c +++ b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c @@ -443,7 +443,7 @@ vega20_set_single_dpm_table(struct smu_context *smu, PPCLK_e clk_id) { int ret = 0; - uint32_t i, num_of_levels, clk; + uint32_t i, num_of_levels = 0, clk; ret = smu_send_smc_msg_with_param(smu, SMU_MSG_GetDpmFreqByIndex, |