[PATCH 7/9] drm/amdgpu: Don't leak runtime pm ref on driver load

[Lukas Wunner]

If an error occurs in amdgpu_device_init() after adev->rmmio has been
set, its caller amdgpu_driver_load_kms() will skip runtime pm
initialization and call amdgpu_driver_unload_kms(), which acquires a
runtime pm ref that is leaked.

Balance by releasing a runtime pm ref in the error path of
amdgpu_driver_load_kms().

Fixes: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)")
Signed-off-by: Lukas Wunner <lukas at wunner.de>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 9b1f979..0db692e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -137,9 +137,12 @@ int amdgpu_driver_load_kms(struct drm_device *dev, 
unsigned long flags)
        }

 out:
-       if (r)
+       if (r) {
+               /* balance pm_runtime_get_sync in amdgpu_driver_unload_kms */
+               if (adev->rmmio && amdgpu_device_is_px(dev))
+                       pm_runtime_put_noidle(dev->dev);
                amdgpu_driver_unload_kms(dev);
-
+       }

        return r;
 }
-- 
2.8.1