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When cloning the engines from the source context, we need to ensure that the engines are not freed as we copy them, and that the flags we clone from the source correspond with the engines we copy across. To do this we need only take a reference to the src->engines, rather than hold the src->engine_mutex, so long as we verify that nothing changed under the read. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Andi Shyti <andi.shyti@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210114135612.13210-3-chris@chris-wilson.co.uk |
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