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    SubjectRE: [PATCH 01/18] dmaengine: add fence support
    Williams, Dan J wrote:
    > Some engines optimize operation by reading ahead in the descriptor chain
    > such that descriptor2 may start execution before descriptor1 completes.
    > If descriptor2 depends on the result from descriptor1 then a fence is
    > required (on descriptor2) to disable this optimization. The async_tx
    > api could implicitly identify dependencies via the 'depend_tx'
    > parameter, but that would constrain cases where the dependency chain
    > only specifies a completion order rather than a data dependency. So,
    > provide an ASYNC_TX_FENCE to explicitly identify data dependencies.
    > Signed-off-by: Dan Williams <>
    > ---

    Signed-off-by: Maciej Sosnowski <>

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      Last update: 2009-09-15 18:11    [W:0.029 / U:104.224 seconds]
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