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PCI: hotplug: acpiphp: avoid acpiphp "cannot get bridge info" PCI hotplug failure

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On some systems, the ACPI bus check event can reference a bridge that is
higher in the ACPI hierarchy than the bridge immediately above the
hotplug PCI slot into which an adapter was just inserted.  The current
'acpiphp' code expects the bus check event to reference the bridge
immediately above the slot that received the adapter so the hotplug
operation can fail on these systems with the message "acpiphp_glue:
cannot get bridge info".  This change fixes the problem by
re-enumerating all slots that lie below the bridge referenced by the bus
check event, including those slots that may be located under lower level
PCI-to-PCI bridge(s).

Signed-off-by: Gary Hade <garyhade@us.ibm.com>
Cc: <lcm@us.ibm.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Gary Hade 2007-07-05 11:10:48 -07:00 committed by Greg Kroah-Hartman
parent 9ef2241b18
commit 0bbd6424c5
1 changed files with 46 additions and 2 deletions
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48
drivers/pci/hotplug/acpiphp_glue.c
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@ -1505,6 +1505,37 @@ static void handle_bridge_insertion(acpi_handle handle, u32 type)
* ACPI event handlers
*/
static acpi_status
count_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
int *count = (int *)context;
struct acpiphp_bridge *bridge;
bridge = acpiphp_handle_to_bridge(handle);
if (bridge)
(*count)++;
return AE_OK ;
}
static acpi_status
check_sub_bridges(acpi_handle handle, u32 lvl, void *context, void **rv)
{
struct acpiphp_bridge *bridge;
char objname[64];
struct acpi_buffer buffer = { .length = sizeof(objname),
.pointer = objname };
bridge = acpiphp_handle_to_bridge(handle);
if (bridge) {
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
dbg("%s: re-enumerating slots under %s\n",
__FUNCTION__, objname);
acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
acpiphp_check_bridge(bridge);
}
return AE_OK ;
}
/**
* handle_hotplug_event_bridge - handle ACPI event on bridges
*
@ -1522,6 +1553,7 @@ static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *cont
struct acpi_buffer buffer = { .length = sizeof(objname),
.pointer = objname };
struct acpi_device *device;
int num_sub_bridges = 0;
if (acpi_bus_get_device(handle, &device)) {
/* This bridge must have just been physically inserted */
@ -1530,7 +1562,12 @@ static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *cont
}
bridge = acpiphp_handle_to_bridge(handle);
if (!bridge) {
if (type == ACPI_NOTIFY_BUS_CHECK) {
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, ACPI_UINT32_MAX,
count_sub_bridges, &num_sub_bridges, NULL);
}
if (!bridge && !num_sub_bridges) {
err("cannot get bridge info\n");
return;
}
@ -1541,7 +1578,14 @@ static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *cont
case ACPI_NOTIFY_BUS_CHECK:
/* bus re-enumerate */
dbg("%s: Bus check notify on %s\n", __FUNCTION__, objname);
acpiphp_check_bridge(bridge);
if (bridge) {
dbg("%s: re-enumerating slots under %s\n",
__FUNCTION__, objname);
acpiphp_check_bridge(bridge);
}
if (num_sub_bridges)
acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
ACPI_UINT32_MAX, check_sub_bridges, NULL, NULL);
break;
case ACPI_NOTIFY_DEVICE_CHECK: