The PASID ECN indicates bit 0 is reserved in the capability register. Switch pci_enable_pasid() to error if PASID is already enabled and don't expose enable as a feature in pci_pasid_features(). Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx> --- drivers/pci/ats.c | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index 831e192..8e95a12 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -348,7 +348,7 @@ int pci_enable_pasid(struct pci_dev *pdev, int features) pci_read_config_word(pdev, pos + PCI_PASID_CONTROL_OFF, &control); pci_read_config_word(pdev, pos + PCI_PASID_CAP_OFF, &supported); - if (!(supported & PCI_PASID_ENABLE)) + if (control & PCI_PASID_ENABLE) return -EINVAL; supported &= PCI_PASID_EXEC | PCI_PASID_PRIV; @@ -390,7 +390,6 @@ EXPORT_SYMBOL_GPL(pci_disable_pasid); * Returns a negative value when no PASI capability is present. * Otherwise is returns a bitmask with supported features. Current * features reported are: - * PCI_PASID_ENABLE - PASID capability can be enabled * PCI_PASID_EXEC - Execute permission supported * PCI_PASID_PRIV - Priviledged mode supported */ @@ -405,7 +404,7 @@ int pci_pasid_features(struct pci_dev *pdev) pci_read_config_word(pdev, pos + PCI_PASID_CAP_OFF, &supported); - supported &= PCI_PASID_ENABLE | PCI_PASID_EXEC | PCI_PASID_PRIV; + supported &= PCI_PASID_EXEC | PCI_PASID_PRIV; return supported; } -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
