Re: PCI: remove bogus resource collision error

From: Rajesh Shah
Date: Thu Nov 17 2005 - 12:52:16 EST

On Wed, Nov 16, 2005 at 05:05:35PM -0800, Greg KH wrote:
> Is the type_mask variable really needed here? Can't we just test:
> if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
> instead?
That'll work too. Here's the updated patch.

When attempting to hotadd a PCI card with a bridge on it, I saw
the kernel reporting resource collision errors even when there were
really no collisions. The problem is that the code doesn't skip
over "invalid" resources with their resource type flag not set.
Others have reported similar problems at boot time and for
non-bridge PCI card hotplug too, where the code flags a
resource collision for disabled ROMs. This patch fixes both

Signed-off-by: Rajesh Shah <rajesh.shah@xxxxxxxxx>

arch/i386/pci/i386.c | 7 +++++--
1 files changed, 5 insertions(+), 2 deletions(-)

Index: linux-2.6.15-rc1/arch/i386/pci/i386.c
--- linux-2.6.15-rc1.orig/arch/i386/pci/i386.c
+++ linux-2.6.15-rc1/arch/i386/pci/i386.c
@@ -221,6 +221,11 @@ int pcibios_enable_resources(struct pci_

r = &dev->resource[idx];
+ if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
+ 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", pci_name(dev));
return -EINVAL;
@@ -230,8 +235,6 @@ int pcibios_enable_resources(struct pci_
if (r->flags & IORESOURCE_MEM)
- if (dev->resource[PCI_ROM_RESOURCE].start)
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);
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at