drm/amdgpu: fix ref count leak in amdgpu_display_crtc_set_config

[ Upstream commit e008fa6fb41544b63973a529b704ef342f47cc65 ]

in amdgpu_display_crtc_set_config, the call to pm_runtime_get_sync
increments the counter even in case of failure, leading to incorrect
ref count. In case of failure, decrement the ref count before returning.

Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index 15a2d8f..fdf7a18 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -268,7 +268,7 @@ int amdgpu_crtc_set_config(struct drm_mode_set *set)
 
        ret = pm_runtime_get_sync(dev->dev);
        if (ret < 0)
-               return ret;
+               goto out;
 
        ret = drm_crtc_helper_set_config(set);
 
@@ -283,7 +283,7 @@ int amdgpu_crtc_set_config(struct drm_mode_set *set)
           take the current one */
        if (active && !adev->have_disp_power_ref) {
                adev->have_disp_power_ref = true;
-               return ret;
+               goto out;
        }
        /* if we have no active crtcs, then drop the power ref
           we got before */
@@ -292,6 +292,7 @@ int amdgpu_crtc_set_config(struct drm_mode_set *set)
                adev->have_disp_power_ref = false;
        }
 
+out:
        /* drop the power reference we got coming in here */
        pm_runtime_put_autosuspend(dev->dev);
        return ret;