Subject: [patch 03/20] acpi bridge hotadd: Fix pci_enable_device() for p2p bridges

From: [email-masked]
Date: Thu, 28 Apr 2005 00:25:45 -0700

From: Rajesh Shah <[email-masked]>

When checking if a PCI to PCI bridge should be enabled to decode memory and/or
IO resources, we need to look at all device resources not just the first 6. 
This is needed to allow PCI bridges to pass down memory and IO accesses to
child devices even when the bridge itself does not consume resources in its
PCI BARs.

Signed-off-by: Rajesh Shah <[email-masked]>
Signed-off-by: Andrew Morton <[email-masked]>
Signed-off-by: Greg Kroah-Hartman <[email-masked]>

---
 arch/ia64/pci/pci.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

--- gregkh-2.6.orig/arch/ia64/pci/pci.c	2005-05-03 22:28:11.000000000 -0700
+++ gregkh-2.6/arch/ia64/pci/pci.c	2005-05-03 22:28:18.000000000 -0700
@@ -436,18 +436,24 @@
 	u16 cmd, old_cmd;
 	int idx;
 	struct resource *r;
+	unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM;
 
 	if (!dev)
 		return -EINVAL;
 
 	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 desired resources.  */
 		if (!(mask & (1 << idx)))
 			continue;
 
 		r = &dev->resource[idx];
+		if (!(r->flags & type_mask))
+			continue;
+		if ((idx == PCI_ROM_RESOURCE) &&
+				(!(r->flags & IORESOURCE_ROM_ENABLE)))
+			continue;
 		if (!r->start && r->end) {
 			printk(KERN_ERR
 			       "PCI: Device %s not available because of resource collisions\n",
@@ -459,8 +465,6 @@
 		if (r->flags & IORESOURCE_MEM)
 			cmd |= PCI_COMMAND_MEMORY;
 	}
-	if (dev->resource[PCI_ROM_RESOURCE].start)
-		cmd |= PCI_COMMAND_MEMORY;
 	if (cmd != old_cmd) {
 		printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
 		pci_write_config_word(dev, PCI_COMMAND, cmd);