device_unregister — unregister device from system.
void device_unregister ( | struct device * | dev); |
We do this in two parts, like we do device_register. First,
we remove it from all the subsystems with device_del, then
we decrement the reference count via put_device. If that
is the final reference count, the device will be cleaned up
via device_release above. Otherwise, the structure will
stick around until the final reference to the device is dropped.