sw_sync deadlock avoidance, take 3

[Bas Nieuwenhuizen]

Hi Chris,

My concern with going in this direction was that we potentially allow
an application to allocate a lot of kernel memory but not a lot of fds
by creating lots of fences and then closing the fds but never
signaling them. Is that not an issue?

- Bas

On Wed, Jul 15, 2020 at 12:04 PM Chris Wilson <chris at chris-wilson.co.uk> wrote:
>
> dma_fence_release() objects to a fence being freed before it is
> signaled, so instead of playing fancy tricks to avoid handling dying
> requests, let's keep the syncpt alive until signaled. This neatly
> removes the issue with having to decouple the syncpt from the timeline
> upon fence release.
> -Chris
>
>
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