David,
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!*
Vitaly
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