On Thu, Aug 3, 2017 at 11:15 AM, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
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 Gotcha, yup nothing prevents that.
> the kernel to segfault?
fence = dma_fence_get_rcu_safe(&syncobj->fence);
if (!fence)
return -EINVAL;
err = await_fence();
dma_fence_put(fence);
if (err < 0)
return;
Happy?
Assuming dma_fence_get_rcu_safe does what I think it does, then yes.
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