On Tue, 31 Jul 2007, David Engraf wrote: > When CONFIG_USB_UHCI_HCD, CONFIG_USB_OHCI_HCD or CONFIG_USB_EHCI_HCD is > not configured we don't need to call the quirk_usb_handoff_xxxx function > in driver/usb/host/pci_quiks.c. > > I think the kernel shouldn't take the control over the usb controller > when we don't have the driver for it, > so with this patch the kernel takes the control only when the driver is > configured.
Have you found a system where this really improves behavior or is it just theoretical? There _is_ a theoretical reason for running the handoff routines even when the corresponding driver isn't configured. Namely, at startup the controller will be in some undetermined state as a result of usage by the firmware. Resetting it to a known idle state is a good idea. Bear in mind that on some systems, not performing the handoff has caused interrupt storms during startup. Alan Stern - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
