ACPI: add debug for device addition

Add debug output for adding an ACPI device.  Enable this with
"acpi.debug_layer=0x00010000" (ACPI_BUS_COMPONENT).

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 408ebde18986d95d47ac6dbbe33e23d1fb58e349..75b7c572ef451a1cc13143ca55a71020aaaab255 100644 (file)
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -1230,6 +1230,7 @@ acpi_add_single_object(struct acpi_device **child,
 {
        int result = 0;
        struct acpi_device *device = NULL;
+       struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 
 
        if (!child)
@@ -1355,9 +1356,16 @@ acpi_add_single_object(struct acpi_device **child,
        }
 
 end:
-       if (!result)
+       if (!result) {
+               acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+               ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                       "Adding %s [%s] parent %s\n", dev_name(&device->dev),
+                        (char *) buffer.pointer,
+                        device->parent ? dev_name(&device->parent->dev) :
+                                         "(null)"));
+               kfree(buffer.pointer);
                *child = device;
-       else
+       } else
                acpi_device_release(&device->dev);
 
        return result;