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-rw-r--r--drivers/acpi/dock.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/acpi/dock.c b/drivers/acpi/dock.c
index e4c1a4f..8c6828b 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;
}
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