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>

1 files changed, 10 insertions, 2 deletions

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 408ebde18986..75b7c572ef45 100644
--- 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;