[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.li...@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