acpi_install_notify_handler() could fail. So check the exit status and give a better debug info. Signed-off-by: Tang Chen <tangchen@xxxxxxxxxxxxxx> --- drivers/acpi/pci_root_hp.c | 12 +++++++++--- 1 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/acpi/pci_root_hp.c b/drivers/acpi/pci_root_hp.c index 1f60533..4c18573 100644 --- a/drivers/acpi/pci_root_hp.c +++ b/drivers/acpi/pci_root_hp.c @@ -242,6 +242,7 @@ static void handle_hotplug_event_root(acpi_handle handle, u32 type, static acpi_status __init find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) { + acpi_status status; char objname[64]; struct acpi_buffer buffer = { .length = sizeof(objname), .pointer = objname }; @@ -254,9 +255,14 @@ find_root_bridges(acpi_handle handle, u32 lvl, void *context, void **rv) acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); - acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, - handle_hotplug_event_root, NULL); - printk(KERN_DEBUG "acpi root: %s notify handler installed\n", objname); + status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, + handle_hotplug_event_root, NULL); + if (ACPI_FAILURE(status)) + printk(KERN_DEBUG "acpi root: %s notify handler not installed\n" + "acpi root: exit status: %u\n", + objname, (unsigned int)status); + else + printk(KERN_DEBUG "acpi root: %s notify handler installed\n", objname); add_acpi_root_bridge(handle); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html