diff -urNp linux-2.4.21/drivers/hotplug/acpiphp_pci.c linux-2.4.21.SUSE/drivers/hotplug/acpiphp_pci.c
--- linux-2.4.21/drivers/hotplug/acpiphp_pci.c	2004-04-02 16:49:05.000000000 +0200
+++ linux-2.4.21.SUSE/drivers/hotplug/acpiphp_pci.c	2004-04-02 16:50:32.000000000 +0200
@@ -78,8 +78,8 @@ static int init_config_space (struct acp
 		if (bar & PCI_BASE_ADDRESS_SPACE_IO) {
 			/* This is IO */
 
-			len = bar & 0xFFFFFFFC;
-			len = ~len + 1;
+			len = bar & (PCI_BASE_ADDRESS_IO_MASK & 0xFFFF);
+			len = len & ~(len-1);
 
 			dbg("len in IO %x, BAR %d\n", len, count);
 
@@ -340,8 +340,9 @@ static int detect_used_resource (struct 
 		if (len & PCI_BASE_ADDRESS_SPACE_IO) {
 			/* This is IO */
 			base = bar & 0xFFFFFFFC;
-			len &= 0xFFFFFFFC;
-			len = ~len + 1;
+
+			len = len & (PCI_BASE_ADDRESS_IO_MASK & 0xFFFF);
+			len = len & ~(len-1);
 
 			dbg("BAR[%d] %08x - %08x (IO)\n", count, (u32)base, (u32)base + len - 1);
 
@@ -465,8 +466,9 @@ int acpiphp_init_func_resource (struct a
 		if (len & PCI_BASE_ADDRESS_SPACE_IO) {
 			/* This is IO */
 			base = bar & 0xFFFFFFFC;
-			len &= 0xFFFFFFFC;
-			len = ~len + 1;
+
+			len = len & (PCI_BASE_ADDRESS_IO_MASK & 0xFFFF);
+			len = len & ~(len-1);
 
 			dbg("BAR[%d] %08x - %08x (IO)\n", count, (u32)base, (u32)base + len - 1);
 
diff -urNp linux-2.4.21/drivers/hotplug/acpiphp_res.c linux-2.4.21.SUSE/drivers/hotplug/acpiphp_res.c
--- linux-2.4.21/drivers/hotplug/acpiphp_res.c	2004-04-02 16:49:05.000000000 +0200
+++ linux-2.4.21.SUSE/drivers/hotplug/acpiphp_res.c	2004-04-02 16:50:32.000000000 +0200
@@ -225,7 +225,7 @@ struct pci_resource *acpiphp_get_io_reso
 		}  /* End of too big on top end */
 
 		/* For IO make sure it's not in the ISA aliasing space */
-		if (node->base & 0x300L)
+		if ((node->base & 0x300L) && !(node->base & 0xfffff000))
 			continue;
 
 		/* If we got here, then it is the right size