1 files changed, 5 insertions, 15 deletions

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index e3cf8a2e6292..4170113cde61 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -775,7 +775,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
         /* Check if setup is sensible at all */
         if (!pass &&
             (primary != bus->number || secondary <= bus->number ||
-             secondary > subordinate || subordinate > bus->busn_res.end)) {
+             secondary > subordinate)) {
                 dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
                          secondary, subordinate);
                 broken = 1;
@@ -838,23 +838,18 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
                         goto out;
                 }
 
-                if (max >= bus->busn_res.end) {
-                        dev_warn(&dev->dev, "can't allocate child bus %02x from %pR\n",
-                                 max, &bus->busn_res);
-                        goto out;
-                }
-
                 /* Clear errors */
                 pci_write_config_word(dev, PCI_STATUS, 0xffff);
 
-                /* The bus will already exist if we are rescanning */
+                /* Prevent assigning a bus number that already exists.
+                 * This can happen when a bridge is hot-plugged, so in
+                 * this case we only re-scan this bus. */
                 child = pci_find_bus(pci_domain_nr(bus), max+1);
                 if (!child) {
                         child = pci_add_new_bus(bus, dev, max+1);
                         if (!child)
                                 goto out;
-                        pci_bus_insert_busn_res(child, max+1,
-                                                bus->busn_res.end);
+                        pci_bus_insert_busn_res(child, max+1, 0xff);
                 }
                 max++;
                 buses = (buses & 0xff000000)
@@ -913,11 +908,6 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev *dev, int max, int pass)
                 /*
                  * Set the subordinate bus number to its real value.
                  */
-                if (max > bus->busn_res.end) {
-                        dev_warn(&dev->dev, "max busn %02x is outside %pR\n",
-                                 max, &bus->busn_res);
-                        max = bus->busn_res.end;
-                }
                 pci_bus_update_busn_res_end(child, max);
                 pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
         }