Attilio Rao
30c7dd147c
br_prod_tail and br_cons_tail members are used as barrier to ...
signal bug_ring ownership. However, instructions can be reordered
around members write leading to stale values for ie. br_prod_bufs.
Use correct memory barriers to ensure proper ordering of the
ownership tokens updates.
Sponsored by: EMC / Isilon storage division
MFC after: 2 weeks
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30c7dd147c