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-rw-r--r--drivers/pci/pci.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 692671b1166..d549bbc93cd 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1905,7 +1905,7 @@ void pci_enable_ari(struct pci_dev *dev)
{
int pos;
u32 cap;
- u16 ctrl;
+ u16 flags, ctrl;
struct pci_dev *bridge;
if (!pci_is_pcie(dev) || dev->devfn)
@@ -1923,6 +1923,11 @@ void pci_enable_ari(struct pci_dev *dev)
if (!pos)
return;
+ /* ARI is a PCIe v2 feature */
+ pci_read_config_word(bridge, pos + PCI_EXP_FLAGS, &flags);
+ if ((flags & PCI_EXP_FLAGS_VERS) < 2)
+ return;
+
pci_read_config_dword(bridge, pos + PCI_EXP_DEVCAP2, &cap);
if (!(cap & PCI_EXP_DEVCAP2_ARI))
return;