diff --git a/[refs] b/[refs]
index f6bbfebdb48e..d28ab983bf9e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 41012735352e72b8a3f95521817dcad1b2986636
+refs/heads/master: 5ab0854dd77a520abe7c3b9c7770972fd3e61e90
diff --git a/trunk/drivers/sbus/char/rtc.c b/trunk/drivers/sbus/char/rtc.c
index 18d18f1a114e..b0429917154d 100644
--- a/trunk/drivers/sbus/char/rtc.c
+++ b/trunk/drivers/sbus/char/rtc.c
@@ -12,6 +12,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/smp_lock.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/miscdevice.h>
@@ -213,6 +214,7 @@ static int rtc_open(struct inode *inode, struct file *file)
 {
 	int ret;
 
+	lock_kernel();
 	spin_lock_irq(&mostek_lock);
 	if (rtc_busy) {
 		ret = -EBUSY;
@@ -221,6 +223,7 @@ static int rtc_open(struct inode *inode, struct file *file)
 		ret = 0;
 	}
 	spin_unlock_irq(&mostek_lock);
+	unlock_kernel();
 
 	return ret;
 }