Quoting Chris Wilson (2018-05-16 16:30:13)
> The idea was to try and let the existing tasklet run to completion
> before we began the reset, but it involves a racy check against anything
> else that tries to run the tasklet. Rather than acknowledge and ignore
> the race, let it be and don't try and be too clever.
> 
> The tasklet will resume execution after reset (after spinning a bit
> during reset), but before we allow it to resume we will have cleared all
> the pending state.
> 
> Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
> Reviewed-by: Mika Kuoppala <mika.kuopp...@linux.intel.com>

Apologies for the noise, accidentally squashed a patch during rebasing
and need to recover it for CI.
-Chris
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