Hi Cris,
> Attaching to the i915_active barrier is a two stage process, and a flush
> is only effective when the barrier is activation. Thus it is possible
> for us to see a barrier, and attempt to flush, only for our flush to
> have no effect. As such, before attempting to activate signaling on the
> fence we need to double check it is a fence!
>
> Fixes: d13a31770077 ("drm/i915: Flush idle barriers when waiting")
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxx>
Andi
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