From: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Date: Thu, 13 Jul 2017 10:56:48 -0400
Subject: drm/amd/display: Release cached atomic state in S3.
Git-commit: 0a214e2fb6b0a56519b6d5efab4b21475c233ee0
Patch-mainline: v4.15-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Fixes memory leak.

Signed-off-by: Andrey Grodzovsky <Andrey.Grodzovsky@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -508,6 +508,7 @@ static int dm_suspend(void *handle)
 
 	amdgpu_dm_irq_suspend(adev);
 
+	WARN_ON(adev->dm.cached_state);
 	adev->dm.cached_state = drm_atomic_helper_suspend(adev->ddev);
 
 	dc_set_power_state(
@@ -607,6 +608,9 @@ int amdgpu_dm_display_resume(struct amdg
 
 	ret = drm_atomic_helper_resume(ddev, adev->dm.cached_state);
 
+	drm_atomic_state_put(adev->dm.cached_state);
+	adev->dm.cached_state = NULL;
+
 	amdgpu_dm_irq_resume_late(adev);
 
 	return ret;