2.6.27-rc5-mmotm0829 - CONFIG_HID_COMPAT causes hangs at boot

[Valdis . Kletnieks]

I built a rc5-mmotm kernel, and set CONFIG_HID_COMPAT=y, but then found
that I didn't actually *need* any of quirks files that tries to load, so
those all got set to 'n'.

The resulting kernel would get this far (using a HID_COMPAT=n kernel's dmesg
and annotating, I couldn't get netconsole) and then hang while still running
off the initrd:

[    1.665167] usb 1-8: New USB device found, idVendor=413c, idProduct=0058
[    1.678083] usb 1-8: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    1.753101] usb 1-8.1: new low speed USB device using ehci_hcd and address 5
[    1.842008] usb 1-8.1: configuration #1 chosen from 1 choice
[    1.869343] usb 1-8.1: New USB device found, idVendor=045e, idProduct=0023
[    1.882267] usb 1-8.1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[    1.895189] usb 1-8.1: Product: Microsoft Trackball Optical®
[    1.908056] usb 1-8.1: Manufacturer: Microsoft

(the next line would make it to the console)

[    1.926685] input: Microsoft Microsoft Trackball Optical® as /devices/pci000:00/0000:00:1d.7/usb1/1-8/1-8.1/1-8.1:1.0/input/input1
[    1.945217] generic-usb 0003:045E:0023.0001: input,hidraw0: USB HID v1.00 Mouse [Microsoft Microsoft Trackball Optical®] on usb-0000:00:1d.7-8.1/input0
[    1.959193] usbcore: registered new interface driver usbhid
[    1.973037] usbhid: v2.6:USB HID core driver

(the following line would not)
[    1.987014] Advanced Linux Sound Architecture Driver Version 1.0.18rc1.

Poking around with sysrq-T would show a modprobe process running and not
making any progress, just hung waiting for something.  I can go get the
traceback if needed.

This ring any bells?

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