On Sat, Jun 22, 2013 at 12:13 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Fri, 21 Jun 2013, Ming Lei wrote: > > I'm not sure what you mean. Do you mean that usb_sg_init() should fail > if the SG element length isn't a multiple of the maxpacket size? That > probably will break wireless USB. > > Do you mean that usb_sg_init() should break the transfer up into a > bunch of separate URBs in this case (the way it does when the HCD > doesn't have native support for SG)? That won't work because one of > the URBs would have a transfer length that wasn't a multiple of the > maxpacket size. Yes. Sorry, could you explain why that won't work? I understand the URBs with maxp-unaligned length still can be completed. > > Furthermore, URBs using SG can be submitted directly, without going > through usb_sg_init() at all. So changing usb_sg_init() won't fix the > problem. Looks usbtest use it, so the reported problem can be fixed. Thanks, -- Ming Lei -- 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
