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drm/amd/powerplay: fix null pointer dereference around dpm state relates

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DPM state relates are not supported on the new SW SMU ASICs. But still
it's not OK to trigger null pointer dereference on accessing them.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Evan Quan
2019-07-25 12:10:34 +08:00
committed by Alex Deucher
父節點 fcd90fee8a
當前提交 f0d2a7dc11
共有 2 個文件被更改，包括 15 次插入 和 6 次删除
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18
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
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@@ -159,12 +159,16 @@ static ssize_t amdgpu_get_dpm_state(struct device *dev,
struct amdgpu_device *adev = ddev->dev_private;
enum amd_pm_state_type pm;
if (is_support_sw_smu(adev) && adev->smu.ppt_funcs->get_current_power_state)
pm = amdgpu_smu_get_current_power_state(adev);
else if (adev->powerplay.pp_funcs->get_current_power_state)
if (is_support_sw_smu(adev)) {
if (adev->smu.ppt_funcs->get_current_power_state)
pm = amdgpu_smu_get_current_power_state(adev);
else
pm = adev->pm.dpm.user_state;
} else if (adev->powerplay.pp_funcs->get_current_power_state) {
pm = amdgpu_dpm_get_current_power_state(adev);
else
} else {
pm = adev->pm.dpm.user_state;
}
return snprintf(buf, PAGE_SIZE, "%s\n",
(pm == POWER_STATE_TYPE_BATTERY) ? "battery" :
@@ -191,7 +195,11 @@ static ssize_t amdgpu_set_dpm_state(struct device *dev,
goto fail;
}
if (adev->powerplay.pp_funcs->dispatch_tasks) {
if (is_support_sw_smu(adev)) {
mutex_lock(&adev->pm.mutex);
adev->pm.dpm.user_state = state;
mutex_unlock(&adev->pm.mutex);
} else if (adev->powerplay.pp_funcs->dispatch_tasks) {
amdgpu_dpm_dispatch_task(adev, AMD_PP_TASK_ENABLE_USER_STATE, &state);
} else {
mutex_lock(&adev->pm.mutex);

3
drivers/gpu/drm/amd/powerplay/amdgpu_smu.c
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@@ -305,7 +305,8 @@ int smu_get_power_num_states(struct smu_context *smu,
/* not support power state */
memset(state_info, 0, sizeof(struct pp_states_info));
state_info->nums = 0;
state_info->nums = 1;
state_info->states[0] = POWER_STATE_TYPE_DEFAULT;
return 0;
}