On Thu, 12 Nov 2015, Steinar H. Gunderson wrote: > On Thu, Nov 12, 2015 at 02:42:09PM -0500, Alan Stern wrote: > > You could try getting a "zerocopy" patch to work. See this thread: > > > > http://marc.info/?l=linux-usb&m=140431709523840&w=2 > > I'll have a look. But given that I do isochronous, it sounds like the patch > in that thread won't work? (As I read the discussion there, at least. I don't > know enough xHCI details to understand exactly why a memory mapping is > needed for isochronous but not for bulk transfers.) > > There's always the other patch set that was pointed to > (http://marc.info/?l=linux-usb&m=138046339714340&w=2), which sounds more > promising. You're right; I got the two patch sets mixed up. Considering that it was written a couple of years ago, you'll probably have to do some work to get it to apply to the current kernel. Let me know if you need any help. Alan Stern -- 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
