x86/PCI: Fix infinite loop in search for 64bit BAR placement

Break the loop if we can't find some address space for a 64bit BAR.

Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
index 1e996df687a3..5328e86f73eb 100644
--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -696,8 +696,13 @@ static void pci_amd_enable_64bit_bar(struct pci_dev *dev)
         res->end = 0xfd00000000ull - 1;
 
         /* Just grab the free area behind system memory for this */
-        while ((conflict = request_resource_conflict(&iomem_resource, res)))
+        while ((conflict = request_resource_conflict(&iomem_resource, res))) {
+                if (conflict->end >= res->end) {
+                        kfree(res);
+                        return;
+                }
                 res->start = conflict->end + 1;
+        }
 
         dev_info(&dev->dev, "adding root bus resource %pR\n", res);