device_unregister_wait() discarded?

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Hi,
with the kernel-2.6.3 device_unregister_wait() has been discarded, why?
I regard this function as essential for virtual busses as its device-drivers 
usually create/own the device structs; consequently the struct 
device::release() callback is located in the device-driver module.
In such an environment calling device_unregister() is causing trouble, if 
someone is still holding a reference to the device and the module is getting 
unloaded.

/FAU

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