> Add CardBus interrupt enable flag.  When this flag is asserted, a
> CardBus interrupt is routed to the child devices and vice versa.  This
> flag is negated when a pccbb receives a suspend or stanby event.

This change is simply wrong as implemented.  You cannot just ignore a
level-triggered interrupt; you MUST either service it or cause it to
be masked permanently.  Otherwise the machine will hang.

The correct action would be to add suspend/resume hooks to the drivers
to cause them to shut down and restart cleanly -- unregistering and
reregistering their interrupt handlers as appropriate.