[Xen-devel] Re: [linux-usb-devel] Error recovery in Xen's paravirtualizing USB driver for Linux

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Fri, 9 Dec 2005, Harry Butterworth wrote:

> While you are discussing this stuff, you might like to consider the
> problem of stealing a device from a back-end driver that has already
> claimed it.  I don't know if this is currently possible.  With my
> testing so far I have had to disable the back-end drivers for the
> devices that I wanted to export to stop them from getting the devices
> before me.

It is already possible.  Something like this:

        echo -n 1-2:1.0 >/sys/bus/usb/drivers/[driver]/unbind

Or it can be done using usbfs.  And if you want to do it from within the 
kernel, call device_release_driver(dev).

Alan Stern


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