Re: [RFC PATCH] drm/i915: Use rcu_dereference() in hwsp_offset()

[Sebastian Brzezinka]

TL;DR:
1. If rcu_dereference_protected is intended to prevent use-after-free, it 
currently doesn’t.
2. Does anyone know how we end up in this state and what the proper way to 
prevent it is?
   Adding an if check before engine->emit_fini_breadcrumb feels like a hack.
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Best regards,
Sebastian