Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> writes: > On Thu, Jan 30, 2014 at 04:43:54PM -0500, Alan Stern wrote: > >> ehci-hcd gets along okay with the restriction that each SG element >> except the last has to be a multiple of the maxpacket size. xhci-hcd >> can relax this quite a lot, but not all the way. > > What does the EHCI driver do when it receives a SG list from the USB > networking layer that violates this restriction? The USB networking layer won't use SG with the EHCI driver. Commit bcc48f1a7a0d4 introduced no_sg_constraint so that usbnet could enable SG only for host controllers with no such restrictions. I.e. currently for xHCI only. Bjørn -- 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
