drm/amd/pm: drop unneeded feature->mutex

As all those related APIs are already well protected by adev->pm.mutex.
Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c

@@ -949,7 +949,6 @@ static int smu_sw_init(void *handle)
 
 	smu->pool_size = adev->pm.smu_prv_buffer_size;
 	smu->smu_feature.feature_num = SMU_FEATURE_MAX;
-	mutex_init(&smu->smu_feature.mutex);
 	bitmap_zero(smu->smu_feature.supported, SMU_FEATURE_MAX);
 	bitmap_zero(smu->smu_feature.enabled, SMU_FEATURE_MAX);
 	bitmap_zero(smu->smu_feature.allowed, SMU_FEATURE_MAX);

drivers/gpu/drm/amd/pm/swsmu/inc/amdgpu_smu.h

@@ -391,7 +391,6 @@ struct smu_feature
 	DECLARE_BITMAP(supported, SMU_FEATURE_MAX);
 	DECLARE_BITMAP(allowed, SMU_FEATURE_MAX);
 	DECLARE_BITMAP(enabled, SMU_FEATURE_MAX);
-	struct mutex mutex;
 };
 
 struct smu_clocks {

drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c

@@ -722,25 +722,21 @@ int smu_v13_0_set_allowed_mask(struct smu_context *smu)
 	int ret = 0;
 	uint32_t feature_mask[2];
 
-	mutex_lock(&feature->mutex);
-	if (bitmap_empty(feature->allowed, SMU_FEATURE_MAX) || feature->feature_num < 64)
-		goto failed;
+	if (bitmap_empty(feature->allowed, SMU_FEATURE_MAX) ||
+	    feature->feature_num < 64)
+		return -EINVAL;
 
 	bitmap_copy((unsigned long *)feature_mask, feature->allowed, 64);
 
 	ret = smu_cmn_send_smc_msg_with_param(smu, SMU_MSG_SetAllowedFeaturesMaskHigh,
 					      feature_mask[1], NULL);
 	if (ret)
-		goto failed;
-
-	ret = smu_cmn_send_smc_msg_with_param(smu, SMU_MSG_SetAllowedFeaturesMaskLow,
-					      feature_mask[0], NULL);
-	if (ret)
-		goto failed;
+		return ret;
 
-failed:
-	mutex_unlock(&feature->mutex);
-	return ret;
+	return smu_cmn_send_smc_msg_with_param(smu,
+					       SMU_MSG_SetAllowedFeaturesMaskLow,
+					       feature_mask[0],
+					       NULL);
 }
 
 int smu_v13_0_gfx_off_control(struct smu_context *smu, bool enable)

drivers/gpu/drm/amd/pm/swsmu/smu_cmn.c

@@ -481,7 +481,6 @@ int smu_cmn_feature_is_supported(struct smu_context *smu,
 {
 	struct smu_feature *feature = &smu->smu_feature;
 	int feature_id;
-	int ret = 0;
 
 	feature_id = smu_cmn_to_asic_specific_index(smu,
 						    CMN2ASIC_MAPPING_FEATURE,
@@ -491,11 +490,7 @@ int smu_cmn_feature_is_supported(struct smu_context *smu,
 
 	WARN_ON(feature_id > feature->feature_num);
 
-	mutex_lock(&feature->mutex);
-	ret = test_bit(feature_id, feature->supported);
-	mutex_unlock(&feature->mutex);
-
-	return ret;
+	return test_bit(feature_id, feature->supported);
 }
 
 int smu_cmn_feature_is_enabled(struct smu_context *smu,
@@ -504,7 +499,6 @@ int smu_cmn_feature_is_enabled(struct smu_context *smu,
 	struct smu_feature *feature = &smu->smu_feature;
 	struct amdgpu_device *adev = smu->adev;
 	int feature_id;
-	int ret = 0;
 
 	if (smu->is_apu && adev->family < AMDGPU_FAMILY_VGH)
 		return 1;
@@ -517,11 +511,7 @@ int smu_cmn_feature_is_enabled(struct smu_context *smu,
 
 	WARN_ON(feature_id > feature->feature_num);
 
-	mutex_lock(&feature->mutex);
-	ret = test_bit(feature_id, feature->enabled);
-	mutex_unlock(&feature->mutex);
-
-	return ret;
+	return test_bit(feature_id, feature->enabled);
 }
 
 bool smu_cmn_clk_dpm_is_enabled(struct smu_context *smu,
@@ -666,14 +656,12 @@ int smu_cmn_feature_update_enable_state(struct smu_context *smu,
 			return ret;
 	}
 
-	mutex_lock(&feature->mutex);
 	if (enabled)
 		bitmap_or(feature->enabled, feature->enabled,
 				(unsigned long *)(&feature_mask), SMU_FEATURE_MAX);
 	else
 		bitmap_andnot(feature->enabled, feature->enabled,
 				(unsigned long *)(&feature_mask), SMU_FEATURE_MAX);
-	mutex_unlock(&feature->mutex);
 
 	return ret;
 }
@@ -843,11 +831,8 @@ int smu_cmn_disable_all_features_with_exception(struct smu_context *smu,
 	}
 
 	if (no_hw_disablement) {
-		mutex_lock(&feature->mutex);
 		bitmap_andnot(feature->enabled, feature->enabled,
 				(unsigned long *)(&features_to_disable), SMU_FEATURE_MAX);
-		mutex_unlock(&feature->mutex);
-
 		return 0;
 	} else {
 		return smu_cmn_feature_update_enable_state(smu,