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PCI/ACPI: Print info if host bridge notify handler installation fails

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acpi_install_notify_handler() could fail.  So check the exit status
and give a better debug info.

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Tang Chen 2013-01-21 13:20:49 -08:00 committed by Bjorn Helgaas
parent 668192b678
commit 121b090e7d
1 changed files with 9 additions and 3 deletions
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12
drivers/acpi/pci_root.c
View file

@ -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;
}