[Bug 75502] [SNB, IVB libva+rc6] Page flips hang indefinitely, apparently waiting for mmio writes that never happen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75502

--- Comment #35 from Chris Wilson <chris at chris-wilson.co.uk> ---
Created attachment 97221
  --> https://bugs.freedesktop.org/attachment.cgi?id=97221&action=edit
Reorder semaphore deadlock detection

It's #54226 again, but we failed to simply kick the stuck semaphore and
declared the GPU hung instead. The attached patch should detect the situation
better, but the root cause behind the hangs still remains unresolved.

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