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.
Alan Stern
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