1 files changed, 6 insertions, 1 deletions

diff --git a/arch/m68k/bvme6000/rtc.c b/arch/m68k/bvme6000/rtc.c
index a812d03879f8..e8ac3f7d72df 100644
--- a/arch/m68k/bvme6000/rtc.c
+++ b/arch/m68k/bvme6000/rtc.c
@@ -10,6 +10,7 @@
 #include <linux/errno.h>
 #include <linux/miscdevice.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 #include <linux/ioport.h>
 #include <linux/capability.h>
 #include <linux/fcntl.h>
@@ -140,10 +141,14 @@ static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
 
 static int rtc_open(struct inode *inode, struct file *file)
 {
-        if(rtc_status)
+        lock_kernel();
+        if(rtc_status) {
+                unlock_kernel();
                 return -EBUSY;
+        }
 
         rtc_status = 1;
+        unlock_kernel();
         return 0;
 }