[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: sta...@vger.kernel.org # v3.12
Signed-off-by: Wentao Liang <vu...@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