Quoting [email protected] (2018-03-16 18:31:05)
> +bool intel_engine_cancel_fpreempt(struct intel_engine_cs *engine)
> +{
> +       hrtimer_cancel(&engine->fpreempt_timer);

Can not be used inside the tasklet as the hrtimer may also be a tasklet
on the same CPU; so busy spin deadlock.
-Chris
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