> lsmod | grep usb
> usbcore                78784   1
>
> rmmod usbcore
> usbcore: Device or resource busy
>
> why is it so ? is there a way to rmmod usbcore ?

You must unmount /proc/bus/usb before unloading usbcore. Don't forget to 
remount it after loading the module back.

Laurent Pinchart



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