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Rather than assume if and only if the engine->default_state is not set that the context is invalid, instead track when we know the context has valid state -- either because we have copied the default_state or we have completed a context switch to save the HW state. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Acked-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191203124155.3019926-1-chris@chris-wilson.co.uk