Merge tag 'pci-v4.2-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI fixes from Bjorn Helgaas:
 "These are fixes for ASPM-related NULL pointer dereference crashes on
  Sparc and PowerPC and 64-bit PCI address-related HPMC crashes on
  PA-RISC.  These are both caused by things we merged in the v4.2 merge
  window.  Details:

  Resource management
    - Don't use 64-bit bus addresses on PA-RISC

  Miscellaneous
    - Tolerate hierarchies with no Root Port"

* tag 'pci-v4.2-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
  PCI: Don't use 64-bit bus addresses on PA-RISC
  PCI: Tolerate hierarchies with no Root Port

2 files changed, 7 insertions, 2 deletions

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 73de4efcbe6e..944f50015ed0 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -2,7 +2,7 @@
 # PCI configuration
 #
 config PCI_BUS_ADDR_T_64BIT
-        def_bool y if (ARCH_DMA_ADDR_T_64BIT || 64BIT)
+        def_bool y if (ARCH_DMA_ADDR_T_64BIT || (64BIT && !PARISC))
         depends on PCI
 
 config PCI_MSI
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index cefd636681b6..b978bbfe044c 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -997,7 +997,12 @@ void set_pcie_port_type(struct pci_dev *pdev)
         else if (type == PCI_EXP_TYPE_UPSTREAM ||
                  type == PCI_EXP_TYPE_DOWNSTREAM) {
                 parent = pci_upstream_bridge(pdev);
-                if (!parent->has_secondary_link)
+
+                /*
+                 * Usually there's an upstream device (Root Port or Switch
+                 * Downstream Port), but we can't assume one exists.
+                 */
+                if (parent && !parent->has_secondary_link)
                         pdev->has_secondary_link = 1;
         }
 }