pci: Fix ordering of devices when CONFIG_PCI_SCAN_SHOW

Move the printing of PCI device information to before the PCI device is
configured.  This prevents the case where recursive scanning results in
the deepest devices being printed first.

This change also makes PCI lockups during enumeration easier to
diagnose since the device that is being configured is printed out prior
to configuration.  Previously, it was not possible to determine which
device caused the PCI lockup.

Original example:
  PCIE1: connected as Root Complex
        04:01.0 - 8086:1010 - Network controller
        04:01.1 - 8086:1010 - Network controller
        03:00.0 - 10b5:8112 - Bridge device
        02:01.0 - 10b5:8518 - Bridge device
        02:02.0 - 10b5:8518 - Bridge device
        08:00.0 - 1957:0040 - Processor
        07:00.0 - 10b5:8518 - Bridge device
        09:00.0 - 10b5:8112 - Bridge device
        07:01.0 - 10b5:8518 - Bridge device
        07:02.0 - 10b5:8518 - Bridge device
        06:00.0 - 10b5:8518 - Bridge device
        02:03.0 - 10b5:8518 - Bridge device
        01:00.0 - 10b5:8518 - Bridge device
  PCIE1: Bus 00 - 0b

Updated example:
  PCIE1: connected as Root Complex
        01:00.0 - 10b5:8518 - Bridge device
        02:01.0 - 10b5:8518 - Bridge device
        03:00.0 - 10b5:8112 - Bridge device
        04:01.0 - 8086:1010 - Network controller
        04:01.1 - 8086:1010 - Network controller
        02:02.0 - 10b5:8518 - Bridge device
        02:03.0 - 10b5:8518 - Bridge device
        06:00.0 - 10b5:8518 - Bridge device
        07:00.0 - 10b5:8518 - Bridge device
        08:00.0 - 1957:0040 - Processor
        07:01.0 - 10b5:8518 - Bridge device
        09:00.0 - 10b5:8112 - Bridge device
        07:02.0 - 10b5:8518 - Bridge device
  PCIE1: Bus 00 - 0b

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 3dccf88581814eb25b8dd41fdbb50aefdd9906cf..78f7339e35cae1618deef1c2689191e3ad87124d 100644 (file)
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -645,6 +645,14 @@ int pci_hose_scan_bus(struct pci_controller *hose, int bus)
                pci_hose_read_config_word(hose, dev, PCI_DEVICE_ID, &device);
                pci_hose_read_config_word(hose, dev, PCI_CLASS_DEVICE, &class);
 
+#ifdef CONFIG_PCI_SCAN_SHOW
+               if (pci_print_dev(hose, dev)) {
+                       printf("        %02x:%02x.%x - %04x:%04x - %s\n",
+                              PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev),
+                              vendor, device, pci_class_str(class >> 8));
+               }
+#endif
+
                cfg = pci_find_config(hose, class, vendor, device,
                                      PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev));
                if (cfg) {
@@ -657,16 +665,9 @@ int pci_hose_scan_bus(struct pci_controller *hose, int bus)
                        sub_bus = max(sub_bus, n);
 #endif
                }
+
                if (hose->fixup_irq)
                        hose->fixup_irq(hose, dev);
-
-#ifdef CONFIG_PCI_SCAN_SHOW
-               if (pci_print_dev(hose, dev)) {
-                       printf("        %02x:%02x.%x - %04x:%04x - %s\n",
-                              PCI_BUS(dev), PCI_DEV(dev), PCI_FUNC(dev),
-                              vendor, device, pci_class_str(class >> 8));
-               }
-#endif
        }
 
        return sub_bus;