diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/pseries/msi.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c index 3e0d6ef3eca..bf2e1ac4130 100644 --- a/arch/powerpc/platforms/pseries/msi.c +++ b/arch/powerpc/platforms/pseries/msi.c @@ -356,6 +356,27 @@ static int rtas_msi_check_device(struct pci_dev *pdev, int nvec, int type) return 0; } +static int check_msix_entries(struct pci_dev *pdev) +{ + struct msi_desc *entry; + int expected; + + /* There's no way for us to express to firmware that we want + * a discontiguous, or non-zero based, range of MSI-X entries. + * So we must reject such requests. */ + + expected = 0; + list_for_each_entry(entry, &pdev->msi_list, list) { + if (entry->msi_attrib.entry_nr != expected) { + pr_debug("rtas_msi: bad MSI-X entries.\n"); + return -EINVAL; + } + expected++; + } + + return 0; +} + static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) { struct pci_dn *pdn; @@ -367,6 +388,9 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) if (!pdn) return -ENODEV; + if (type == PCI_CAP_ID_MSIX && check_msix_entries(pdev)) + return -EINVAL; + /* * Try the new more explicit firmware interface, if that fails fall * back to the old interface. The old interface is known to never |