diff --git a/[refs] b/[refs]
index f2bff8cd80e2..c9ae074060cb 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e3e8e59dcd63621e3ade03083c17b6363a8e2dc8
+refs/heads/master: db41bc9c4dfeed656dfd63d26883f81abc4005df
diff --git a/trunk/drivers/char/mwave/mwavedd.c b/trunk/drivers/char/mwave/mwavedd.c
index 8d14823b0514..50243fcd87e8 100644
--- a/trunk/drivers/char/mwave/mwavedd.c
+++ b/trunk/drivers/char/mwave/mwavedd.c
@@ -56,6 +56,7 @@
 #include <linux/serial.h>
 #include <linux/sched.h>
 #include <linux/spinlock.h>
+#include <linux/smp_lock.h>
 #include <linux/delay.h>
 #include <linux/serial_8250.h>
 #include "smapi.h"
@@ -100,6 +101,7 @@ static int mwave_open(struct inode *inode, struct file *file)
 	PRINTK_2(TRACE_MWAVE,
 		"mwavedd::mwave_open, exit return retval %x\n", retval);
 
+	cycle_kernel_lock();
 	return retval;
 }