During the suspend/resume programming I came to an issue that first 4KB of

memory must be clear with 0s because otherwise the resources of K8 will be
totally messed up.

res = probe_resource(dev, 0x100 + (reg | link));

This is called with dev = NULL and this is no good for probe_resource at all.
The attached patch fixes the potential problems and of course the problem
itself. On one particular place was missing test if the device really exists.
This was copied to fam10 and perhaps the same issue is in v3 (DID NOT check).
The rest of the patch is just very paranoid and do all checkings.

Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Acked-by: Myles Watson <mylesgw@gmail.com>
--This line, and those below, will be igno
red--

M    src/devices/pci_ops.c
M    src/northbridge/amd/amdk8/northbridge.c
M    src/northbridge/amd/amdfam10/northbridge.c


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4030 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

src/devices/pci_ops.c

@@ -27,7 +27,13 @@
 
 static struct bus *get_pbus(device_t dev)
 {
-	struct bus *pbus = dev->bus;
+	struct bus *pbus;
+
+	if (!dev)
+		printk_alert("get_pbus: dev is NULL!\n");
+
+	pbus = dev->bus;
+
 	while(pbus && pbus->dev && !ops_pci_bus(pbus)) {
 		if (pbus == pbus->dev->bus) {
 			printk_alert("%s in endless loop looking for a parent "

src/northbridge/amd/amdfam10/northbridge.c

@@ -338,6 +338,8 @@ static int reg_useable(u32 reg,device_t goal_dev, u32 goal_nodeid,
 	for(nodeid = 0; !res && (nodeid < NODE_NUMS); nodeid++) {
 		device_t dev;
 		dev = __f0_dev[nodeid];
+		if (!dev)
+			continue;
 		for(link = 0; !res && (link < 8); link++) {
 			res = probe_resource(dev, 0x1000 + reg + (link<<16)); // 8 links, 0x1000 man f1,
 		}

src/northbridge/amd/amdk8/northbridge.c

@@ -291,9 +291,11 @@ static int reg_useable(unsigned reg,
 	unsigned nodeid, link;
 	int result;
 	res = 0;
-	for(nodeid = 0; !res && (nodeid < 8); nodeid++) {
+	for(nodeid = 0; !res && (nodeid < FX_DEVS); nodeid++) {
 		device_t dev;
 		dev = __f0_dev[nodeid];
+		if (!dev)
+			continue;
 		for(link = 0; !res && (link < 3); link++) {
 			res = probe_resource(dev, 0x100 + (reg | link));
 		}
@@ -760,14 +762,15 @@ static struct hw_mem_hole_info get_hw_mem_hole_info(void)
 		mem_hole.hole_startk = HW_MEM_HOLE_SIZEK;
 		mem_hole.node_id = -1;
 
-		for (i = 0; i < 8; i++) {
+		for (i = 0; i < FX_DEVS; i++) {
 			uint32_t base;
 			uint32_t hole;
 			base  = f1_read_config32(0x40 + (i << 3));
 			if ((base & ((1<<1)|(1<<0))) != ((1<<1)|(1<<0))) {
 				continue;
 			}
-
+			if (!__f1_dev[i])
+				continue;
 			hole = pci_read_config32(__f1_dev[i], 0xf0);
 			if(hole & 1) { // we find the hole
 				mem_hole.hole_startk = (hole & (0xff<<24)) >> 10;
@@ -834,15 +837,15 @@ static void disable_hoist_memory(unsigned long hole_startk, int i)
 	limit = f1_read_config32(0x44 + (i << 3));
 	f1_write_config32(0x44 + (i << 3),limit - (hole_sizek << 2));
 	dev = __f1_dev[i];
+	if (dev) {
 		hoist = pci_read_config32(dev, 0xf0);
 		if(hoist & 1) {
 			pci_write_config32(dev, 0xf0, 0);
-	}
+		} else {
-	else {
 			base = pci_read_config32(dev, 0x40 + (i << 3));
 			f1_write_config32(0x40 + (i << 3),base - (hole_sizek << 2));
 		}
-
+	}
 }
 
 static uint32_t hoist_memory(unsigned long hole_startk, int i)
@@ -878,7 +881,7 @@ static uint32_t hoist_memory(unsigned long hole_startk, int i)
 		base |= (4*1024*1024)<<2;
 		f1_write_config32(0x40 + (i<<3), base);
 	}
-	else
+	else if (dev)
 	{
 		hoist = /* hole start address */
 			((hole_startk << 10) & 0xff000000) +
@@ -1020,7 +1023,7 @@ static void pci_domain_set_resources(device_t dev)
 		#if HW_MEM_HOLE_SIZE_AUTO_INC == 1
 			//We need to double check if the mmio_basek is valid for hole setting, if it is equal to basek, we need to decrease it some
 			uint32_t basek_pri;
-			for (i = 0; i < 8; i++) {
+			for (i = 0; i < FX_DEVS; i++) {
 				uint32_t base;
 				uint32_t basek;
 				base  = f1_read_config32(0x40 + (i << 3));
@@ -1045,7 +1048,7 @@ static void pci_domain_set_resources(device_t dev)
 #endif
 
 	idx = 0x10;
-	for(i = 0; i < 8; i++) {
+	for(i = 0; i < FX_DEVS; i++) {
 		uint32_t base, limit;
 		unsigned basek, limitk, sizek;
 		base  = f1_read_config32(0x40 + (i << 3));