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

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
parent fcd90fee8a
commit f0d2a7dc11
2 changed files with 15 additions and 6 deletions
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16
drivers/gpu/drm/amd/amdgpu/amdgpu_pm.c
View File

@ -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)
if (is_support_sw_smu(adev)) {
if (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)
pm = amdgpu_dpm_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 {
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
View File

@ -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;
}