intel-iommu: Make "Unknown DMAR structure" message more informative

[safe/jmp/linux-2.6] / drivers / pci / bus.c

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 40af27f..cef28a7 100644 (file)
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -206,13 +206,18 @@ void pci_enable_bridges(struct pci_bus *bus)
  *  Walk the given bus, including any bridged devices
  *  on buses under this bus.  Call the provided callback
  *  on each device found.
+ *
+ *  We check the return of @cb each time. If it returns anything
+ *  other than 0, we break out.
+ *
  */
-void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
+void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
                  void *userdata)
 {
        struct pci_dev *dev;
        struct pci_bus *bus;
        struct list_head *next;
+       int retval;
 
        bus = top;
        down_read(&pci_bus_sem);
@@ -236,8 +241,10 @@ void pci_walk_bus(struct pci_bus *top, void (*cb)(struct pci_dev *, void *),
 
                /* Run device routines with the device locked */
                down(&dev->dev.sem);
-               cb(dev, userdata);
+               retval = cb(dev, userdata);
                up(&dev->dev.sem);
+               if (retval)
+                       break;
        }
        up_read(&pci_bus_sem);
 }