diff --git a/[refs] b/[refs]
index ce427c5cabaa..ec678df6b875 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 65c19bbd28cba587d9bd24feccf7272da18481a7
+refs/heads/master: 415d320a2384bb80d2be98b1dfa41594e085012d
diff --git a/trunk/drivers/acpi/scan.c b/trunk/drivers/acpi/scan.c
index a0ab828b2cc5..2cb3b0916eba 100644
--- a/trunk/drivers/acpi/scan.c
+++ b/trunk/drivers/acpi/scan.c
@@ -471,7 +471,6 @@ static int acpi_bus_get_perf_flags(struct acpi_device *device)
    -------------------------------------------------------------------------- */
 
 static LIST_HEAD(acpi_bus_drivers);
-static DECLARE_MUTEX(acpi_bus_drivers_lock);
 
 /**
  * acpi_bus_match - match device IDs to driver's supported IDs