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/* This is a called from the DMA ISR context when the DMA is still in
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* progress and is actively filling same buffer.
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* size. In other cases, this will not even be called as there is no
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* hardware support for it.
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* queued, DMA programs the HW to use that req when this req is
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* completed. If there is no "next req" queued, then DMA ISR doesn't do
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* anything before calling this callback.