Merge branches 'pm-cpufreq', 'pm-cpuidle', 'pm-devfreq', 'pm-opp' and 'pm-tools'

[linux-drm-fsl-dcu.git] / arch / x86 / pci / xen.c

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 9098d880c476cf842598d32805ed25ac37fc9ae1..d22f4b5bbc04d896088558b65026303e714f16c8 100644 (file)
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -298,12 +298,16 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
                        map_irq.entry_nr = nvec;
                } else if (type == PCI_CAP_ID_MSIX) {
                        int pos;
+                       unsigned long flags;
                        u32 table_offset, bir;
 
                        pos = dev->msix_cap;
                        pci_read_config_dword(dev, pos + PCI_MSIX_TABLE,
                                              &table_offset);
                        bir = (u8)(table_offset & PCI_MSIX_TABLE_BIR);
+                       flags = pci_resource_flags(dev, bir);
+                       if (!flags || (flags & IORESOURCE_UNSET))
+                               return -EINVAL;
 
                        map_irq.table_base = pci_resource_start(dev, bir);
                        map_irq.entry_nr = msidesc->msi_attrib.entry_nr;