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path: root/drivers/pci/hotplug/acpiphp_glue.c
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Diffstat (limited to 'drivers/pci/hotplug/acpiphp_glue.c')
-rw-r--r--drivers/pci/hotplug/acpiphp_glue.c53
1 files changed, 50 insertions, 3 deletions
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 9ef4e989afc..1e125b56c9a 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -1282,7 +1282,7 @@ static unsigned int get_slot_status(struct acpiphp_slot *slot)
/**
* acpiphp_eject_slot - physically eject the slot
*/
-static int acpiphp_eject_slot(struct acpiphp_slot *slot)
+int acpiphp_eject_slot(struct acpiphp_slot *slot)
{
acpi_status status;
struct acpiphp_func *func;
@@ -1368,6 +1368,9 @@ static void program_hpp(struct pci_dev *dev, struct acpiphp_bridge *bridge)
(dev->class >> 8) == PCI_CLASS_BRIDGE_PCI)))
return;
+ if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST)
+ return;
+
pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE,
bridge->hpp.t0->cache_line_size);
pci_write_config_byte(dev, PCI_LATENCY_TIMER,
@@ -1502,6 +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
*
@@ -1519,6 +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 */
@@ -1527,7 +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;
}
@@ -1538,7 +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: