1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index e4c1a4ff4e31..8c6828bee5d9 100644
--- a/drivers/acpi/dock.c
+++ b/drivers/acpi/dock.c
@@ -444,6 +444,9 @@ static int dock_in_progress(struct dock_station *ds)
  */
 int register_dock_notifier(struct notifier_block *nb)
 {
+        if (!dock_station)
+                return -ENODEV;
+
         return atomic_notifier_chain_register(&dock_notifier_list, nb);
 }
 
@@ -455,6 +458,9 @@ EXPORT_SYMBOL_GPL(register_dock_notifier);
  */
 void unregister_dock_notifier(struct notifier_block *nb)
 {
+        if (!dock_station)
+                return;
+
         atomic_notifier_chain_unregister(&dock_notifier_list, nb);
 }
 
@@ -807,7 +813,7 @@ static int __init dock_init(void)
                             ACPI_UINT32_MAX, find_dock, &num, NULL);
 
         if (!num)
-                return -ENODEV;
+                printk(KERN_INFO "No dock devices found.\n");
 
         return 0;
 }