parport_unregister_driver — deregister a parallel port device driver
|struct parport_driver * drv|
This should be called by a parallel port device driver that
has registered itself using
parport_register_driver when it
is about to be unloaded.
When it returns, the driver's
attach routine will no longer
be called, and for each port that
attach was called for, the
detach routine will have been called.
All the driver's
detach calls are guaranteed to have
finished by the time this function returns.