From 121b090e7d4063b65f40c267ef0fb34fb278dfdf Mon Sep 17 00:00:00 2001 From: Tang Chen Date: Mon, 21 Jan 2013 13:20:49 -0800 Subject: [PATCH] PCI/ACPI: Print info if host bridge notify handler installation fails acpi_install_notify_handler() could fail. So check the exit status and give a better debug info. Signed-off-by: Tang Chen Signed-off-by: Yinghai Lu Signed-off-by: Bjorn Helgaas Acked-by: Rafael J. Wysocki --- drivers/acpi/pci_root.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c index 1389811..fd59f57 100644 --- a/drivers/acpi/pci_root.c +++ b/drivers/acpi/pci_root.c @@ -769,6 +769,7 @@ 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 }; @@ -781,9 +782,14 @@ 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 is not installed, exit status: %u\n", + objname, (unsigned int)status); + else + printk(KERN_DEBUG "acpi root: %s notify handler is installed\n", + objname); return AE_OK; } -- 2.7.4