Re: PROBLEM: Devices behind PCI Express-to-PCI bridge not mapped

[Ivan Kokshaysky <ink@jurassic.park.msu.ru>]

On Wed, Jun 08, 2005 at 07:34:09PM +0200, Andreas Koch wrote:
> However, after pci_assign_unassigned_resources() has been called, the
> MEM and PREFETCH regions of the bridge 0000:00:1e.0 (bridge 1) _remain_
> invalid at 0x00000000.

I believe it was _IO_ and PREFETCH (unused windows of that bridge).
Indeed, IO at 0 is fatal...

Here is additional patch which ensures unused windows of the transparent
bridge are disabled. 

Ivan.

--- linux/drivers/pci/setup-bus.c~	Sun Jun  5 18:37:57 2005
+++ linux/drivers/pci/setup-bus.c	Thu Jun  9 01:28:42 2005
@@ -156,7 +156,7 @@ pci_setup_bridge(struct pci_bus *bus)
 
 	/* Set up the top and bottom of the PCI I/O segment for this bus. */
 	pcibios_resource_to_bus(bridge, &region, &b_res[0]);
-	if (b_res[0].flags & IORESOURCE_IO) {
+	if ((b_res[0].flags & IORESOURCE_IO) && (region.end > region.start)) {
 		pci_read_config_dword(bridge, PCI_IO_BASE, &l);
 		l &= 0xffff0000;
 		l |= (region.start >> 8) & 0x00f0;
@@ -182,7 +182,7 @@ pci_setup_bridge(struct pci_bus *bus)
 	/* Set up the top and bottom of the PCI Memory segment
 	   for this bus. */
 	pcibios_resource_to_bus(bridge, &region, &b_res[1]);
-	if (b_res[1].flags & IORESOURCE_MEM) {
+	if ((b_res[1].flags & IORESOURCE_MEM) && (region.end > region.start)) {
 		l = (region.start >> 16) & 0xfff0;
 		l |= region.end & 0xfff00000;
 		DBG(KERN_INFO "  MEM window: %08lx-%08lx\n",
@@ -201,7 +201,8 @@ pci_setup_bridge(struct pci_bus *bus)
 
 	/* Set up PREF base/limit. */
 	pcibios_resource_to_bus(bridge, &region, &b_res[2]);
-	if (b_res[2].flags & IORESOURCE_PREFETCH) {
+	if ((b_res[2].flags & IORESOURCE_PREFETCH) &&
+	    (region.end > region.start)) {
 		l = (region.start >> 16) & 0xfff0;
 		l |= region.end & 0xfff00000;
 		DBG(KERN_INFO "  PREFETCH window: %08lx-%08lx\n",
-
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