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drm/amd/powerplay: initialize a variable before using it 

Function vega10_apply_state_adjust_rules() only initializes
stable_pstate_sclk_dpm_percentage when
data->registry_data.stable_pstate_sclk_dpm_percentage is not between 1
and 100. The variable is then used to compute stable_pstate_sclk, which
therefore uses an uninitialized value.

Fix this by initializing stable_pstate_sclk_dpm_percentage to
data->registry_data.stable_pstate_sclk_dpm_percentage.

This issue has been found while building the kernel with clang. The
compiler reported a -Wsometimes-uninitialized warning.

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Fixes: f83a999164 ("drm/amd/powerplay: add Vega10 powerplay support (v5)")
Signed-off-by: Nicolas Iooss <nicolas.iooss_linux@m4x.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicolas Iooss 2017-09-03 14:00:57 +02:00 committed by Alex Deucher
parent 1d864b82a2
commit 0d1da3c152
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
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@ -3138,6 +3138,8 @@ static int vega10_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
minimum_clocks.memoryClock = hwmgr->display_config.min_mem_set_clock;
if (PP_CAP(PHM_PlatformCaps_StablePState)) {
stable_pstate_sclk_dpm_percentage =
data->registry_data.stable_pstate_sclk_dpm_percentage;
PP_ASSERT_WITH_CODE(
data->registry_data.stable_pstate_sclk_dpm_percentage >= 1 &&
data->registry_data.stable_pstate_sclk_dpm_percentage <= 100,