some question about unbind and rebind usb interfaces

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hi all:
below patch introduce unbind and rebind interfaces during usb reset
https://lists.ubuntu.com/archives/kernel-team/2014-April/042177.html
"If a driver claims additional interfaces, the
claim may fail because the old binding instance may still own the
additional interface when the new instance tries to claim it. "

After usb_reset_device, the whole enumeration will run again, why this
patch say the previous solution will be fail to claim additional
interface?

thanks for your help in advance,
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