The key problem is that currently running setscene tasks are not
accounted for when processing task migrations. This means can allow
two of the same task to execute at the same time with unpredictable
effects.
This change allows us to stop doing that and refactor the code slightly
to make it clearer that these conditions don't arrive even with
deferred tasks.
(Bitbake rev: ac1922d348613ca46a1047ad5ddf755eac16d568)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
e18bb3f56b