drm/i915/gem: Take a copy of the engines for context_barrier_task
When applying the context-barrier, we only care about the current engines, as the next set of engines will be naturally after the barrier. So we can skip holding the ctx->engines_mutex while constructing the request by taking a sneaky reference to the i915_gem_engines instead. Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by:
Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200311221739.30375-2-chris@chris-wilson.co.uk
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