On Wed, 2010-02-17 at 11:09 +0100, Oliver Neukum wrote: > > No problem here. USB core does the mapping only if the low-level driver > so requests. The only exception is in usb_buffer_alloc(), but that boils > down to dma_alloc_coherent() Allright, so why do we need to "fix" anything ? Or is the whole thread moot ? :-) It's pretty clear that between dma_map* and subsequent unmap, the memory is owned by the device and must not be touched by the CPU. If that is violated, then we have a driver bug. Cheers, Ben. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
