[PATCH] PCI: use bus numbers sparsely, if necessary

Add a warning if a child bus may be inaccessible because the
parent bridge has wrong secondary or subordinate bus numbers.
Note that this may or may not happen on "transparent" bridges,
as can be seen in bug #5557.

Also, if we do not fix up the assignment of bus numbers, try to
make use of the bus number space available.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 00ba6a03dca56b44a94f555134995f3af2295158..3c9834d8085014b054b3329c95cf76c5f9b3d365 100644 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -433,7 +433,7 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max
 {
        struct pci_bus *child;
        int is_cardbus = (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS);
-       u32 buses, i;
+       u32 buses, i, j = 0;
        u16 bctl;
 
        pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
@@ -543,10 +543,29 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max
                         * as cards with a PCI-to-PCI bridge can be
                         * inserted later.
                         */
-                       for (i=0; i<CARDBUS_RESERVE_BUSNR; i++)
+                       for (i=0; i<CARDBUS_RESERVE_BUSNR; i++) {
+                               struct pci_bus *parent = bus;
                                if (pci_find_bus(pci_domain_nr(bus),
                                                        max+i+1))
                                        break;
+                               while (parent->parent) {
+                                       if ((!pcibios_assign_all_busses()) &&
+                                           (parent->subordinate > max) &&
+                                           (parent->subordinate <= max+i)) {
+                                               j = 1;
+                                       }
+                                       parent = parent->parent;
+                               }
+                               if (j) {
+                                       /*
+                                        * Often, there are two cardbus bridges
+                                        * -- try to leave one valid bus number
+                                        * for each one.
+                                        */
+                                       i /= 2;
+                                       break;
+                               }
+                       }
                        max += i;
                        pci_fixup_parent_subordinate_busnr(child, max);
                }
@@ -561,6 +580,22 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max
 
        sprintf(child->name, (is_cardbus ? "PCI CardBus #%02x" : "PCI Bus #%02x"), child->number);
 
+       while (bus->parent) {
+               if ((child->subordinate > bus->subordinate) ||
+                   (child->number > bus->subordinate) ||
+                   (child->number < bus->number) ||
+                   (child->subordinate < bus->number)) {
+                       printk(KERN_WARNING "PCI: Bus #%02x (-#%02x) may be "
+                              "hidden behind%s bridge #%02x (-#%02x)%s\n",
+                              child->number, child->subordinate,
+                              bus->self->transparent ? " transparent" : " ",
+                              bus->number, bus->subordinate,
+                              pcibios_assign_all_busses() ? " " :
+                              " (try 'pci=assign-busses')");
+               }
+               bus = bus->parent;
+       }
+
        return max;
 }