This allows us to convert aucom to just another com attachment, and cleanup
some code in the com_arbus.c.
Additionally, we use a common com_cleanup routine rather than having a
zillion copies of it in the attachment points.
This has been tested on a number architectures, and it has been shown to get
close to comparable performance when COM_REGMAP is defined, and comparable
when it is not defined.
Approved by core@. Fixes PR port-evbmips/32362.
- Check "csc->cc_ih != NULL" before cardbus_intr_disestablish()
in com_cardbus_detach().
This fixed panic when the card removed.
The card is a "Xircom RealPort Cardbus Ethernet 10/100+Modem 56".
Reported & Tested by Peter Postma <peter.postma@chello.nl>
on current-users.
