[PATCH] reduce ioremap memory size for Adaptec I2O controllers

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>

drivers/message/i2o/pci.c

@@ -133,6 +133,21 @@ static int __devinit i2o_pci_alloc(struct i2o_controller *c)
 			if (!c->base.phys) {
 				c->base.phys = pci_resource_start(pdev, i);
 				c->base.len = pci_resource_len(pdev, i);
+
+				/*
+				 * If we know what card it is, set the size
+				 * correctly. Code is taken from dpt_i2o.c
+				 */
+				if(pdev->device == 0xa501) {
+					if(pdev->subsystem_device >= 0xc032 &&
+					   pdev->subsystem_device <= 0xc03b) {
+						if(c->base.len > 0x400000)
+							c->base.len = 0x400000;
+					} else {
+						if(c->base.len > 0x100000)
+							c->base.len = 0x100000;
+					}
+				}
 				if (!c->raptor)
 					break;
 			} else {