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Date: Tue, 31 Jul 2007 11:04:18 -0400 (EDT) From: Alan Stern <stern@...land.harvard.edu> To: David Engraf <david.engraf@...com.eu> cc: linux-kernel@...r.kernel.org, <linux-pci@...ey.karlin.mff.cuni.cz>, <gregkh@...e.de>, <linux-usb-devel@...ts.sourceforge.net> Subject: Re: [linux-usb-devel] [PATCH] USB BIOS early handoff only when the we the driver is configured 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 majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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