On Wed, Dec 14, 2011 at 03:59:59PM -0500, Alan Stern wrote:
> On Wed, 14 Dec 2011, Felipe Balbi wrote:
>
> > Some controllers support scatter/gather transfers
> > and that might be very useful for some gadget drivers.
> >
> > Signed-off-by: Felipe Balbi <balbi@xxxxxx>
>
> > @@ -88,6 +91,9 @@ struct usb_request {
> > unsigned length;
> > dma_addr_t dma;
> >
> > + struct scatterlist *sg;
> > + unsigned num_sgs;
> > +
>
> You may also need a num_mapped_sgs field. See commit
> bc677d5b64644c399cd3db6a905453e611f402ab (usb: fix number of mapped SG
> DMA entries) in Greg's usb-next branch.
Makes sense, I didn't envision the possibility of dma_map_sg() not
mapping all entries. Will change that part re-test and re-send.
FYI, my test ran over night and I transferred over 800 GiBs, it's still
running while I reply to mails ;-)
--
balbi
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