BUG: 'Unknown symbol in module' happens after reloading ehci-hcd module

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Hi,

'Unknown symbol in module'  happens after the actions below:

         rmmod ehci-hcd
         modprobe ehci-hcd

kernel version: 2.6.35-rc6+gregkh tree+wireless tree

dmsg info:
[  689.025428] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[  689.025431] Warning! ehci_hcd should always be loaded before
uhci_hcd and ohci_hcd, not after
[  689.025434] ehci_hcd: block sizes: qh 104 qtd 96 itd 192 sitd 96

>From source code of ehci-hcd, seems debugfs_create_dir or usb_debug_root
in ehci_hcd_init is thought as unknown symbol mistakenly by kernel.

-- 
Lei Ming
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