diff options
Diffstat (limited to 'drivers/pci/hotplug/acpiphp_glue.c')
| -rw-r--r-- | drivers/pci/hotplug/acpiphp_glue.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 596172b4ae95..fce1c54a0c8d 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -459,8 +459,17 @@ static int add_bridge(acpi_handle handle) { acpi_status status; unsigned long long tmp; + struct acpi_pci_root *root; acpi_handle dummy_handle; + /* + * We shouldn't use this bridge if PCIe native hotplug control has been + * granted by the BIOS for it. + */ + root = acpi_pci_find_root(handle); + if (root && (root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)) + return -ENODEV; + /* if the bridge doesn't have _STA, we assume it is always there */ status = acpi_get_handle(handle, "_STA", &dummy_handle); if (ACPI_SUCCESS(status)) { @@ -1376,13 +1385,23 @@ static void handle_hotplug_event_func(acpi_handle handle, u32 type, static acpi_status find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) { + struct acpi_pci_root *root; int *count = (int *)context; - if (acpi_is_root_bridge(handle)) { - acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, - handle_hotplug_event_bridge, NULL); - (*count)++; - } + if (!acpi_is_root_bridge(handle)) + return AE_OK; + + root = acpi_pci_find_root(handle); + if (!root) + return AE_OK; + + if (root->osc_control_set & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL) + return AE_OK; + + (*count)++; + acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, + handle_hotplug_event_bridge, NULL); + return AE_OK ; } |