Quoting Chris Wilson (2018-05-14 21:52:13)
> We call i915_gem_reset_prepare_engine() during reset and then upon
> wedging if the reset fails. Unfortunately, kthread_park and similar do
> not support being called recursively and so we must count the number of
> times we prepare for reset and only actually prepare on the outermost
> layer. (Similarly for finish on unwinding the onion.)

On an alternate timeline, I posted patches to remove the call to
kthread_park...
-Chris
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