[PATCH] drm/amdgpu: lock the eviction fence before signaling it

[Prike Liang]

Lock and refer to the eviction fence before trying to signal it.

Signed-off-by: Prike Liang <Prike.Liang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_eviction_fence.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_eviction_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_eviction_fence.c
index 1a7469543db5..dd272c1fcbb4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_eviction_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_eviction_fence.c
@@ -108,13 +108,16 @@ amdgpu_eviction_fence_suspend_worker(struct work_struct *work)
 	struct amdgpu_eviction_fence *ev_fence;
 
 	mutex_lock(&uq_mgr->userq_mutex);
-	ev_fence = evf_mgr->ev_fence;
+	spin_lock(&evf_mgr->ev_fence_lock);
+	ev_fence = (struct amdgpu_eviction_fence *)dma_fence_get(&evf_mgr->ev_fence->base);
+	spin_unlock(&evf_mgr->ev_fence_lock);
 	if (!ev_fence)
 		goto unlock;
 
 	amdgpu_userq_evict(uq_mgr, ev_fence);
 
 unlock:
+	dma_fence_put(&evf_mgr->ev_fence->base);
 	mutex_unlock(&uq_mgr->userq_mutex);
 }
 
-- 
2.34.1