drm/amdgpu: fix userq resource double freed

As the userq resource was already freed at the drm_release
early phase, it should avoid freeing userq resource again
at the later kms postclose callback.

Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Jesse Zhang <Jesse.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: prliangpub

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c

@@ -1502,10 +1502,11 @@ void amdgpu_driver_postclose_kms(struct drm_device *dev,
 		amdgpu_bo_unreserve(pd);
 	}
 
-	fpriv->evf_mgr.fd_closing = true;
-	amdgpu_userq_mgr_fini(&fpriv->userq_mgr);
-	amdgpu_eviction_fence_destroy(&fpriv->evf_mgr);
-
+	if (!fpriv->evf_mgr.fd_closing) {
+		fpriv->evf_mgr.fd_closing = true;
+		amdgpu_userq_mgr_fini(&fpriv->userq_mgr);
+		amdgpu_eviction_fence_destroy(&fpriv->evf_mgr);
+	}
 	amdgpu_ctx_mgr_fini(&fpriv->ctx_mgr);
 	amdgpu_vm_fini(adev, &fpriv->vm);