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authorAlex Chiang <achiang@hp.com>2009-07-23 17:03:05 -0600
committerJesse Barnes <jbarnes@virtuousgeek.org>2009-09-09 13:29:23 -0700
commit5228a828ee044834d78abdf25306bf46b19dcc4d (patch)
treeb64bab920f7b2b8704ac6df4eaa389e3aa99064e
parent76d56de57ae60c6be383e48e7068fd973d5fb08a (diff)
PCI Hotplug: acpiphp: get pci_bus from acpi handle correctly
We cannot simply call acpi_get_pci_dev() on any random ACPI handle and hope that it works, because a PCI root bridge may not have an associated struct pci_dev. This is allowed per the PCI specification, and is referred to as a non-materialized bridge. So, depending on the type of PCI bridge that the handle points to, use the appropriate interface to return the struct pci_bus correctly. Reviewed-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Signed-off-by: Alex Chiang <achiang@hp.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
-rw-r--r--drivers/pci/hotplug/acpiphp_glue.c28
1 files changed, 17 insertions, 11 deletions
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 0cb0f830a99..2e5f25969e1 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -62,6 +62,22 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus);
static void acpiphp_set_hpp_values(acpi_handle handle, struct pci_bus *bus);
static void handle_hotplug_event_func(acpi_handle handle, u32 type, void *context);
+static struct pci_bus *pci_bus_from_handle(acpi_handle handle)
+{
+ struct pci_bus *pbus;
+ struct acpi_pci_root *root;
+
+ root = acpi_pci_find_root(handle);
+ if (root)
+ pbus = root->bus;
+ else {
+ struct pci_dev *pdev = acpi_get_pci_dev(handle);
+ pbus = pdev->subordinate;
+ pci_dev_put(pdev);
+ }
+ return pbus;
+}
+
/* callback routine to check for the existence of a pci dock device */
static acpi_status
is_pci_dock_device(acpi_handle handle, u32 lvl, void *context, void **rv)
@@ -1387,16 +1403,7 @@ static void acpiphp_sanitize_bus(struct pci_bus *bus)
/* Program resources in newly inserted bridge */
static int acpiphp_configure_bridge (acpi_handle handle)
{
- struct pci_dev *dev;
- struct pci_bus *bus;
-
- dev = acpi_get_pci_dev(handle);
- if (!dev) {
- err("cannot get PCI domain and bus number for bridge\n");
- return -EINVAL;
- }
-
- bus = dev->bus;
+ struct pci_bus *bus = pci_bus_from_handle(handle);
pci_bus_size_bridges(bus);
pci_bus_assign_resources(bus);
@@ -1404,7 +1411,6 @@ static int acpiphp_configure_bridge (acpi_handle handle)
acpiphp_set_hpp_values(handle, bus);
pci_enable_bridges(bus);
acpiphp_configure_ioapics(handle);
- pci_dev_put(dev);
return 0;
}