Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6:
  PCI: Fix IRQ swizzling for ARI-enabled devices
  ia64/PCI: adjust section annotation for pcibios_setup()
  x86/PCI: get root CRS before scanning children
  x86/PCI: fix boundary checking when using root CRS
  PCI MSI: Fix restoration of MSI/MSI-X mask states in suspend/resume
  PCI MSI: Unmask MSI if setup failed
  PCI MSI: shorten PCI_MSIX_ENTRY_* symbol names
  PCI: make pci_name() take const argument
  PCI: More PATA quirks for not entering D3
  PCI: fix kernel-doc warnings
  PCI: check if bus has a proper bridge device before triggering SBR
  PCI: remove pci_dac_dma_... APIs on mn10300
  PCI ECRC: Remove unnecessary semicolons
  PCI MSI: Return if alloc_msi_entry for MSI-X failed

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 6c93af5ced18..dbd0f947f497 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1517,11 +1517,20 @@ void pci_enable_ari(struct pci_dev *dev)
  *
  * Perform INTx swizzling for a device behind one level of bridge.  This is
  * required by section 9.1 of the PCI-to-PCI bridge specification for devices
- * behind bridges on add-in cards.
+ * behind bridges on add-in cards.  For devices with ARI enabled, the slot
+ * number is always 0 (see the Implementation Note in section 2.2.8.1 of
+ * the PCI Express Base Specification, Revision 2.1)
  */
 u8 pci_swizzle_interrupt_pin(struct pci_dev *dev, u8 pin)
 {
-        return (((pin - 1) + PCI_SLOT(dev->devfn)) % 4) + 1;
+        int slot;
+
+        if (pci_ari_enabled(dev->bus))
+                slot = 0;
+        else
+                slot = PCI_SLOT(dev->devfn);
+
+        return (((pin - 1) + slot) % 4) + 1;
 }
 
 int
@@ -2171,7 +2180,7 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
         u16 ctrl;
         struct pci_dev *pdev;
 
-        if (dev->subordinate)
+        if (pci_is_root_bus(dev->bus) || dev->subordinate || !dev->bus->self)
                 return -ENOTTY;
 
         list_for_each_entry(pdev, &dev->bus->devices, bus_list)