Use a struct pcmcia_device-based approach to inform "clients" of events.  It
needs to be done using bus_for_each_device() so that we don't need to take the
device_list spinlock.
Signed-off-by: Dominik Brodowski <linux@brodo.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>