[PATCH] x86_64: Calgary IOMMU - fix off by one error

Fixed off-by-one error in detect_calgary and calgary_init which will
cause arrays to overflow. Also, removed impossible to hit BUG_ON.

Signed-off-by: Jon Mason <[e-mail]>
Signed-off-by: Muli Ben-Yehuda <[e-mail]>
Signed-off-by: Andi Kleen <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/x86_64/kernel/pci-calgary.c

···
 	int i, ret = -ENODEV;
 	struct pci_dev *dev = NULL;
 
-	for (i = 0; i <= num_online_nodes() * MAX_NUM_OF_PHBS; i++) {
+	for (i = 0; i < num_online_nodes() * MAX_NUM_OF_PHBS; i++) {
 		dev = pci_get_device(PCI_VENDOR_ID_IBM,
 				     PCI_DEVICE_ID_IBM_CALGARY,
 				     dev);
···
 	specified_table_size = determine_tce_table_size(end_pfn * PAGE_SIZE);
 
 	for (bus = 0, table_idx = 0;
-	     bus <= num_online_nodes() * MAX_PHB_BUS_NUM;
+	     bus < num_online_nodes() * MAX_PHB_BUS_NUM;
 	     bus++) {
-		BUG_ON(bus > MAX_NUMNODES * MAX_PHB_BUS_NUM);
 		if (read_pci_config(bus, 0, 0, 0) != PCI_VENDOR_DEVICE_ID_CALGARY)
 			continue;
 		if (test_bit(bus, translation_disabled)) {
···
 			if (p == endp)
 				break;
 
-			if (bridge <= (num_online_nodes() * MAX_PHB_BUS_NUM)) {
+			if (bridge < (num_online_nodes() * MAX_PHB_BUS_NUM)) {
 				printk(KERN_INFO "Calgary: disabling "
 				       "translation for PHB 0x%x\n", bridge);
 				set_bit(bridge, translation_disabled);