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path: root/drivers/pci/probe.c
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Diffstat (limited to 'drivers/pci/probe.c')
-rw-r--r--drivers/pci/probe.c53
1 files changed, 42 insertions, 11 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index fd48b201eb5..df3bdae2040 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -239,9 +239,8 @@ void __devinit pci_read_bridge_bases(struct pci_bus *child)
if (dev->transparent) {
printk(KERN_INFO "PCI: Transparent bridge - %s\n", pci_name(dev));
- for(i = 0; i < PCI_BUS_NUM_RESOURCES; i++)
- child->resource[i] = child->parent->resource[i];
- return;
+ for(i = 3; i < PCI_BUS_NUM_RESOURCES; i++)
+ child->resource[i] = child->parent->resource[i - 3];
}
for(i=0; i<3; i++)
@@ -374,8 +373,11 @@ struct pci_bus * __devinit pci_add_new_bus(struct pci_bus *parent, struct pci_de
struct pci_bus *child;
child = pci_alloc_child_bus(parent, dev, busnr);
- if (child)
+ if (child) {
+ spin_lock(&pci_bus_lock);
list_add_tail(&child->node, &parent->children);
+ spin_unlock(&pci_bus_lock);
+ }
return child;
}
@@ -395,6 +397,16 @@ static void pci_enable_crs(struct pci_dev *dev)
pci_write_config_word(dev, rpcap + PCI_EXP_RTCTL, rpctl);
}
+static void __devinit pci_fixup_parent_subordinate_busnr(struct pci_bus *child, int max)
+{
+ struct pci_bus *parent = child->parent;
+ while (parent->parent && parent->subordinate < max) {
+ parent->subordinate = max;
+ pci_write_config_byte(parent->self, PCI_SUBORDINATE_BUS, max);
+ parent = parent->parent;
+ }
+}
+
unsigned int __devinit pci_scan_child_bus(struct pci_bus *bus);
/*
@@ -411,7 +423,7 @@ 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;
+ u32 buses, i;
u16 bctl;
pci_read_config_dword(dev, PCI_PRIMARY_BUS, &buses);
@@ -447,7 +459,7 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max
return max;
}
- child = pci_alloc_child_bus(bus, dev, busnr);
+ child = pci_add_new_bus(bus, dev, busnr);
if (!child)
return max;
child->primary = buses & 0xFF;
@@ -470,7 +482,11 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max
/* Clear errors */
pci_write_config_word(dev, PCI_STATUS, 0xffff);
- child = pci_alloc_child_bus(bus, dev, ++max);
+ /* Prevent assigning a bus number that already exists.
+ * This can happen when a bridge is hot-plugged */
+ if (pci_find_bus(pci_domain_nr(bus), max+1))
+ return max;
+ child = pci_add_new_bus(bus, dev, ++max);
buses = (buses & 0xff000000)
| ((unsigned int)(child->primary) << 0)
| ((unsigned int)(child->secondary) << 8)
@@ -492,7 +508,13 @@ int __devinit pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max
if (!is_cardbus) {
child->bridge_ctl = PCI_BRIDGE_CTL_NO_ISA;
-
+ /*
+ * Adjust subordinate busnr in parent buses.
+ * We do this before scanning for children because
+ * some devices may not be detected if the bios
+ * was lazy.
+ */
+ pci_fixup_parent_subordinate_busnr(child, max);
/* Now we can scan all subordinate buses... */
max = pci_scan_child_bus(child);
} else {
@@ -501,7 +523,12 @@ 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.
*/
- max += CARDBUS_RESERVE_BUSNR;
+ for (i=0; i<CARDBUS_RESERVE_BUSNR; i++)
+ if (pci_find_bus(pci_domain_nr(bus),
+ max+i+1))
+ break;
+ max += i;
+ pci_fixup_parent_subordinate_busnr(child, max);
}
/*
* Set the subordinate bus number to its real value.
@@ -757,7 +784,9 @@ pci_scan_single_device(struct pci_bus *bus, int devfn)
* and the bus list for fixup functions, etc.
*/
INIT_LIST_HEAD(&dev->global_list);
+ spin_lock(&pci_bus_lock);
list_add_tail(&dev->bus_list, &bus->devices);
+ spin_unlock(&pci_bus_lock);
return dev;
}
@@ -878,7 +907,9 @@ struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, int bus,
pr_debug("PCI: Bus %04x:%02x already known\n", pci_domain_nr(b), bus);
goto err_out;
}
+ spin_lock(&pci_bus_lock);
list_add_tail(&b->node, &pci_root_buses);
+ spin_unlock(&pci_bus_lock);
memset(dev, 0, sizeof(*dev));
dev->parent = parent;
@@ -911,8 +942,6 @@ struct pci_bus * __devinit pci_scan_bus_parented(struct device *parent, int bus,
b->subordinate = pci_scan_child_bus(b);
- pci_bus_add_devices(b);
-
return b;
sys_create_link_err:
@@ -922,7 +951,9 @@ class_dev_create_file_err:
class_dev_reg_err:
device_unregister(dev);
dev_reg_err:
+ spin_lock(&pci_bus_lock);
list_del(&b->node);
+ spin_unlock(&pci_bus_lock);
err_out:
kfree(dev);
kfree(b);