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    SubjectRe: Nobody cared about IRQs at shutdown
    On Thu, 25 Nov 2010, Alexander E. Patrakov wrote:

    > 25.11.2010 21:06, Alan Stern wrote:
    > > On Thu, 25 Nov 2010, Alexander E. Patrakov wrote:
    > >
    > >> Hello.
    > >>
    > >> After switching my Gentoo desktop from sysvinit + openrc to systemd, I
    > >> started getting "nobody cared" messages about IRQs 16 and 19 (common
    > >> thing: they are assigned to the USB controllers, that's why CC:
    > > According to your listing, they are used by uhci-hcd. Do the messages
    > > go away if you unload uhci-hcd before shutting down?
    >
    > It is not a module here, so I have to recompile the kernel in order to
    > try this. Will do that tomorrow.
    >
    > > You may need to debug the uhci-hcd driver. Look into
    > > drivers/usb/host/uhci-hcd.c; the uhci_shutdown() routine ought to be
    > > called and it ought to call uhci_hc_died(), which in turn calls
    > > uhci_reset_hc() in pci-quirks.c, which is supposed to prevent the
    > > controller from generating any IRQs.
    >
    > OK, tomorrow I will add some printks there.
    >
    > > Do you have any USB devices attached to bus 3 or bus 6?
    >
    > Yes:
    >
    > Bus 006 Device 002: ID 05d8:4002 Ultima Electronics Corp. Artec Ultima
    > 2000 (GT6801 based)/Lifetec LT9385/ScanMagic 1200 UB Plus Scanner
    >
    > Should I unplug it and retest the bug now?

    Sure.

    Even without rebuilding the kernel, you can unbind the uhci-hcd driver
    from the hardware by going to the /sys/bus/pci/drivers/uhci_hcd
    directory and doing:

    echo -n device-name >unbind

    where "device-name" is the name of one of the symlinks in that
    directory.

    Alan Stern



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