Am Mittwoch, 17. Februar 2010 10:40:09 schrieb Benjamin Herrenschmidt: > What bugs me here is that the dma_map_* operation should always > be done at the lowest level, ie, the actual HCD driver, and thus > it should be up to the HCD to decide whether to dma_map or not > depending on whether it's going to do DMA or not. I haven't > scrutinized USB lately but if that isn't the case and the dma_map_* > operations are done behind your back by the USB core then that needs to > be changed in a way or another, or hooked at least. 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() Regards Oliver -- 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
