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    SubjectRe: OHCI root_port_reset() deadly loop...
    From
    From: David Brownell <david-b@pacbell.net>
    Date: Mon, 08 Oct 2007 22:00:19 -0700

    > Assuming PCI is present, /sys/bus/pci/devices/*/class can tell
    > if EHCI is present (0x0c0320) ... if so, load that driver.
    > Then repeat for OHCI (0x0c0310) and UHCI (0x0c0300).

    These are facts all of us know very well, but implementing this in
    userspace in a failsafe manner isn't practical. That's what we're
    discussing.

    There are things that autoload USB drivers way before udev or similar
    even get started.

    For example, the first thing some distributions do is try to load the
    correct keyboard maps. Guess what that can do? It triggers a load of
    all of the modular USB host controller drivers in case we have a USB
    keyboard.

    The only real solution is in the kernel, because it is the only
    clean place to trap all of the potential module load events.
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