drm/amdgpu fix amdgpu.dpm=0 (v2)

Fix crash when disabling dpm.

v2: agd5f: fix coding style, cleanup commit message
Signed-off-by: Sonny Jiang <sonny.jiang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/cz_dpm.c

@@ -1206,10 +1206,7 @@ static int cz_dpm_enable(struct amdgpu_device *adev)
 
 static int cz_dpm_hw_init(struct amdgpu_device *adev)
 {
-	int ret;
-
-	if (!amdgpu_dpm)
-		return 0;
+	int ret = 0;
 
 	mutex_lock(&adev->pm.mutex);
 
@@ -1229,6 +1226,12 @@ static int cz_dpm_hw_init(struct amdgpu_device *adev)
 		return ret;
 	}
 
+	if (!amdgpu_dpm) {
+		adev->pm.dpm_enabled = false;
+		mutex_unlock(&adev->pm.mutex);
+		return ret;
+	}
+
 	/* cz dpm setup asic */
 	cz_dpm_setup_asic(adev);
 
@@ -1326,6 +1329,12 @@ static int cz_dpm_resume(struct amdgpu_device *adev)
 		return ret;
 	}
 
+	if (!amdgpu_dpm) {
+		adev->pm.dpm_enabled = false;
+		mutex_unlock(&adev->pm.mutex);
+		return ret;
+	}
+
 	/* cz dpm setup asic */
 	cz_dpm_setup_asic(adev);