misc questions about the device&driver arch

[william wallace]

Sir :
question one :
     I see lots' of use of pcib_get_bus  but i cannot see the
defination ,where is it ?

question two:
what is the relationship among  1device_delete_child
2devclass_delete_device and  3devclass_delete_driver
there seems some overlap among them :)
1devclass_delete_driver   ->device_detach->devclass_delete_device

2device_delete_child   -> device_detach

                             thank u!!

we who r about to die,salute u!