Hello everyone, On 04.02.2015 12:39, Hans Verkuil wrote: > On 02/04/15 12:34, Laurent Pinchart wrote: >> On Wednesday 04 February 2015 11:56:58 Florian Echtler wrote: >>> That's what I assumed, however, I'm running into the same problem as >>> with dma-sg when I switch to vmalloc...? >> >> I don't expect vmalloc to work, as you can't DMA to vmalloc memory directly >> without any IOMMU in the general case (the allocated memory being physically >> fragmented). >> >> dma-sg should work though, but you won't be able to use usb_bulk_msg(). You >> need to create the URBs manually, set their sg and num_sgs fields and submit >> them. Can I also use usb_sg_init/_wait for this? I can't find any other driver which uses USB in conjunction with dma-sg, can you suggest one I could use as an example? > Anyway Florian, based on Laurent's explanation I think trying to make > dma-sg work seems to be the best solution. And I've learned something > new :-) Thanks for the clarification, please ignore the v2 patch submission for now :-) Best, Florian -- SENT FROM MY DEC VT50 TERMINAL
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