Quoting Stuart Summers (2019-11-20 21:13:21)
> GuC submission path can be called from an interrupt context
> and so should use a worker to avoid holding a mutex.

I completely forgot there was still the vestigial GuC submission code...
Ah, I was looking more carefully for engine_put in the wrong context.

Reviewed-by: Chris Wilson <[email protected]>
-Chris
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