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The waiting_seqno is not terribly useful, and as such we can remove it so that we'll be able to extract lockless code. v2: Keep the information for error_state (Chris) Check if ring is initialized in hangcheck (Chris) Capture the waiting ring (Chris) Signed-off-by: Ben Widawsky <ben@bwidawsk.net> [danvet: add some bikeshed to clarify a comment.] Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>