Scanner works on USB-2 port but not on USB-3 because of usbfs claiming the interface

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Hi,

I've been asked to contact this mailing list regarding https://bugzilla.kernel.org/show_bug.cgi?id=42784:

Using the same configuration (kernel-3.3-rc4 and older versions), Canon CanoScan LiDE 20 USB scanner works on the USB-2.0 port, but not on USB-3.0.

usb 5-1: usbfs: interface 0 claimed by usbfs while 'scanimage' sets config #1

This message is not printed when using USB-2.0.

scanimage -L:
No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).

lsusb:
Bus 001 Device 005: ID 04a9:220d Canon, Inc. CanoScan N670U/N676U/LiDE 20

The scanner can be reset using the reset code from
https://bugzilla.redhat.com/show_bug.cgi?id=723696 after adapting the vendor_id and product_id to match those of the Canon scanner:
usb 5-1: new full-speed USB device number 3 using xhci_hcd
usb 5-1: usbfs: interface 0 claimed by usbfs while 'scanimage' sets config #1
usb 5-1: reset full-speed USB device number 3 using xhci_hcd
xhci_hcd 0000:05:00.0: xHCI xhci_drop_endpoint called with disabled ep
ffff880419ba0e40

The next scanimage -L successfully detects the scanner:
scanimage -L
device `plustek:libusb:005:003' is a Canon CanoScan N670U/N676U/LiDE20 flatbed scanner

Unfortunately, it will stop working after a while; There will be messages like "usb 5-1: usbfs: process 12345 (scanbuttond) did not claim interface 0 before use" on repeated use.

If I'm not mistaken, the USB3 chipset is an Etrontech EJ168A (AsRock P67 Extreme 4 Gen2).

Why does usbfs claim the device on USB-3, but not on USB-2? What's wrong here, is there a way to solve it, what can I do about it?

Best regards,
Harald

--
`Experience is the best teacher.'
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