2.6.13-rc2 hangs at boot

[Tero Roponen <teanropo@cc.jyu.fi>]

Hi,

my computer (a ThinkPad 380XD laptop) hangs at boot in 2.6.13-rc2.
When I revert the patch below everything seems to be fine.

thanks,
Tero Roponen


Patch to revert:

Author: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Date: Wed, 15 Jun 2005 14:59:27 +0000 (+0400)
Source: http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=299de0343c7d18448a69c635378342e9214b14af

  [PATCH] PCI: pci_assign_unassigned_resources() on x86

  - Add sanity check for io[port,mem]_resource in setup-bus.c. These
    resources look like "free" as they have no parents, but obviously
    we must not touch them.
  - In i386.c:pci_allocate_bus_resources(), if a bridge resource cannot be
    allocated for some reason, then clear its flags. This prevents any child
    allocations in this range, so the setup-bus code will work with a clean
    resource sub-tree.
  - i386.c:pcibios_enable_resources() doesn't enable bridges, as it checks
    only resources 0-5, which looks like a clear bug to me. I suspect it
    might break hotplug as well in some cases.

  From: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
  Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

--- a/arch/i386/pci/common.c
+++ b/arch/i386/pci/common.c
@@ -165,6 +165,7 @@ static int __init pcibios_init(void)
 	if ((pci_probe & PCI_BIOS_SORT) && !(pci_probe & PCI_NO_SORT))
 		pcibios_sort();
 #endif
+	pci_assign_unassigned_resources();
 	return 0;
 }

--- a/arch/i386/pci/i386.c
+++ b/arch/i386/pci/i386.c
@@ -106,11 +106,16 @@ static void __init pcibios_allocate_bus_
 		if ((dev = bus->self)) {
 			for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
 				r = &dev->resource[idx];
-				if (!r->start)
+				if (!r->flags)
 					continue;
 				pr = pci_find_parent_resource(dev, r);
-				if (!pr || request_resource(pr, r) < 0)
+				if (!r->start || !pr || request_resource(pr, r) < 0) {
 					printk(KERN_ERR "PCI: Cannot allocate resource region %d of bridge %s\n", idx, pci_name(dev));
+					/* Something is wrong with the region.
+					   Invalidate the resource to prevent child
+					   resource allocations in this range. */
+					r->flags = 0;
+				}
 			}
 		}
 		pcibios_allocate_bus_resources(&bus->children);
@@ -227,7 +232,7 @@ int pcibios_enable_resources(struct pci_

 	pci_read_config_word(dev, PCI_COMMAND, &cmd);
 	old_cmd = cmd;
-	for(idx=0; idx<6; idx++) {
+	for(idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
 		/* Only set up the requested stuff */
 		if (!(mask & (1<<idx)))
 			continue;
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -273,6 +273,8 @@ find_free_bus_resource(struct pci_bus *b

 	for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
 		r = bus->resource[i];
+		if (r == &ioport_resource || r == &iomem_resource)
+			continue;
 		if (r && (r->flags & type_mask) == type && !r->parent)
 			return r;
 	}
-
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