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SubjectRe: [PATCH/RFC] SPI: async message handing library update

> if (t->len) {
> /* FIXME if bitbang->use_dma, dma_map_single()
> * before the transfer, and dma_unmap_single()
> * afterwards, for either or both buffers...
> */
please *please* *_please_*!!! don't do it! :)
Let the controller driver do it *only in case it's not working in PIO!*

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