auiestion about ops_run_biodrain() using ADMA

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When there is dependency on async_memcpy(in ops_run_biodrain) by
async_xor(in ops_run_postxor) how is the consistency guaranteed ? I mean
where is the locking. In case of ADMA I see both requests are submitted
suing async_tx_submit(). Is this completely depends on the sequence of
submission ?
Thanks and Regards,
Marri
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