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-rw-r--r--drivers/pci/pci.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d5d6f5667d83..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