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From 092af24d2a8048bc1f9a9d6ecc3d7652740d6d7b Mon Sep 17 00:00:00 2001
From: Arnd Bergmann <arnd@arndb.de>
Date: Mon, 8 Jul 2019 16:07:59 +0200
Subject: [PATCH 2837/2940] drm/amd/powerplay: vega20: fix uninitialized
variable use
If smu_get_current_rpm() fails, we can't use the output,
as that may be uninitialized:
drivers/gpu/drm/amd/amdgpu/../powerplay/vega20_ppt.c:3023:8: error: variable 'current_rpm' is used uninitialized whenever '?:' condition is false [-Werror,-Wsometimes-uninitialized]
ret = smu_get_current_rpm(smu, ¤t_rpm);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../powerplay/inc/amdgpu_smu.h:735:3: note: expanded from macro 'smu_get_current_rpm'
((smu)->funcs->get_current_rpm ? (smu)->funcs->get_current_rpm((smu), (speed)) : 0)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../powerplay/vega20_ppt.c:3024:12: note: uninitialized use occurs here
percent = current_rpm * 100 / pptable->FanMaximumRpm;
^~~~~~~~~~~
drivers/gpu/drm/amd/amdgpu/../powerplay/vega20_ppt.c:3023:8: note: remove the '?:' if its condition is always true
ret = smu_get_current_rpm(smu, ¤t_rpm);
^
drivers/gpu/drm/amd/amdgpu/../powerplay/inc/amdgpu_smu.h:735:3: note: expanded from macro 'smu_get_current_rpm'
((smu)->funcs->get_current_rpm ? (smu)->funcs->get_current_rpm((smu), (speed)) : 0)
^
drivers/gpu/drm/amd/amdgpu/../powerplay/vega20_ppt.c:3020:22: note: initialize the variable 'current_rpm' to silence this warning
uint32_t current_rpm;
Propagate the error code in that case.
Fixes: ee0db82027ee ("drm/amd/powerplay: move PPTable_t uses into asic level")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/powerplay/vega20_ppt.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c
index b779d2b511cf..1fc367307ac0 100644
--- a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c
+++ b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c
@@ -3020,10 +3020,13 @@ static int vega20_get_fan_speed_percent(struct smu_context *smu,
PPTable_t *pptable = smu->smu_table.driver_pptable;
ret = smu_get_current_rpm(smu, ¤t_rpm);
+ if (ret)
+ return ret;
+
percent = current_rpm * 100 / pptable->FanMaximumRpm;
*speed = percent > 100 ? 100 : percent;
- return ret;
+ return 0;
}
static int vega20_get_gpu_power(struct smu_context *smu, uint32_t *value)
--
2.17.1
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