PCI: skip ISA ioresource alignment on some systems

Skip ISA ioresource alignment on some systems

To conserve limited PCI i/o resource on some IBM multi-node systems, the
BIOS allocates (via _CRS) and expects the kernel to use addresses in
ranges currently excluded by pcibios_align_resource() [i386/pci/i386.c].
This change allows the kernel to use the currently excluded address
ranges on the IBM x3800, x3850, and x3950.

Signed-off-by: Gary Hade <gary.hade@us.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 40e571d3c392..59d6c3092812 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -544,7 +544,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass
                         goto out;
                 child->primary = buses & 0xFF;
                 child->subordinate = (buses >> 16) & 0xFF;
-                child->bridge_ctl = bctl;
+                child->bridge_ctl = bctl ^ PCI_BRIDGE_CTL_NO_ISA;
 
                 cmax = pci_scan_child_bus(child);
                 if (cmax > max)
@@ -597,7 +597,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass
                 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
 
                 if (!is_cardbus) {
-                        child->bridge_ctl = bctl | PCI_BRIDGE_CTL_NO_ISA;
+                        child->bridge_ctl = bctl ^ PCI_BRIDGE_CTL_NO_ISA;
                         /*
                          * Adjust subordinate busnr in parent buses.
                          * We do this before scanning for children because