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As the conversion between idle-barrier and full i915_active_fence is already serialised by explicit memory barriers, we can reduce the spinlock in i915_active_acquire_preallocate_barrier() for finding an idle-barrier to reuse to an RCU read lock to ensure the fence remains valid, only taking the spinlock for the update of the rbtree itself. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Thomas Hellström <thomas.hellstrom@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200731085015.32368-6-chris@chris-wilson.co.uk Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>