Quoting Jason Ekstrand (2017-08-03 19:06:02)
> I'm not concerned about what happens to racy clients. They get what they
> get.
> What concerns me is what happens if somehow the fence is replaced and deleted
> before i915_gem_request_await_dma_fence takes it's reference. Can this cause
> the kernel to segfault?
Gotcha, yup nothing prevents that.
fence = dma_fence_get_rcu_safe(&syncobj->fence);
if (!fence)
return -EINVAL;
err = await_fence();
dma_fence_put(fence);
if (err < 0)
return;
Happy?
-Chris
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