The I2O subsystem currently map all memory from the I2O controller for the
controller's in queue, even if it is not necessary.  This is a problem,
because on some systems the size returned from pci_resource_len() could be
128MB and only 1-4MB is needed.

Changes:

- only ioremap as much memory as the controller is actually using.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>