[Nouveau] [Bug 71620] nouveau_fence_wait_uevent NULL pointer dereference

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71620

--- Comment #1 from Kostadin Atanasov <kdatanasov at gmail.com> ---
Created attachment 89720
  --> https://bugs.freedesktop.org/attachment.cgi?id=89720&action=edit
better-multithreaded-protection-for-cence-channel

After almost 2 weeks running with this patch - the same problem happen. Looking
bit more on nouveau_fence_wait function looks like I miss one place where
multithreaded problem could occur - hence second patch to for it.

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