[PATCH] drm: radeon: ci_dpm: Add error handling in ci_enable_vce_dpm()

[Wentao Liang]

The ci_enable_vce_dpm() calls ci_send_msg_to_smc_with_parameter()
but does not check the return value. A proper implementation can be
found in the ci_upload_dpm_level_enable_mask().

Add a check after calling ci_send_msg_to_smc_with_parameter(), return
-EINVAL if the sending fails.

Fixes: cc8dbbb4f62a ("drm/radeon: add dpm support for CI dGPUs (v2)")
Cc: stable at vger.kernel.org # v3.12
Signed-off-by: Wentao Liang <vulab at iscas.ac.cn>
---
 drivers/gpu/drm/radeon/ci_dpm.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/radeon/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c
index 3877863c6893..c4faaa16a5c4 100644
--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -3945,6 +3945,7 @@ static int ci_enable_vce_dpm(struct radeon_device *rdev, bool enable)
 	struct ci_power_info *pi = ci_get_pi(rdev);
 	const struct radeon_clock_and_voltage_limits *max_limits;
 	int i;
+	PPSMC_Result result;
 
 	if (rdev->pm.dpm.ac_power)
 		max_limits = &rdev->pm.dpm.dyn_state.max_clock_voltage_on_ac;
@@ -3962,9 +3963,11 @@ static int ci_enable_vce_dpm(struct radeon_device *rdev, bool enable)
 			}
 		}
 
-		ci_send_msg_to_smc_with_parameter(rdev,
-						  PPSMC_MSG_VCEDPM_SetEnabledMask,
-						  pi->dpm_level_enable_mask.vce_dpm_enable_mask);
+		result = ci_send_msg_to_smc_with_parameter(rdev,
+				PPSMC_MSG_VCEDPM_SetEnabledMask,
+				pi->dpm_level_enable_mask.vce_dpm_enable_mask);
+		if (result != PPSMC_Result_OK)
+			return -EINVAL;
 	}
 
 	return (ci_send_msg_to_smc(rdev, enable ?
-- 
2.42.0.windows.2