1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/char/ds1286.c b/drivers/char/ds1286.c
index ea35ab2c9909..fb584938c9c3 100644
--- a/drivers/char/ds1286.c
+++ b/drivers/char/ds1286.c
@@ -27,6 +27,7 @@
  * option) any later version.
  */
 #include <linux/ds1286.h>
+#include <linux/smp_lock.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/miscdevice.h>
@@ -252,6 +253,7 @@ static int ds1286_ioctl(struct inode *inode, struct file *file,
 
 static int ds1286_open(struct inode *inode, struct file *file)
 {
+        lock_kernel();
         spin_lock_irq(&ds1286_lock);
 
         if (ds1286_status & RTC_IS_OPEN)
@@ -260,10 +262,12 @@ static int ds1286_open(struct inode *inode, struct file *file)
         ds1286_status |= RTC_IS_OPEN;
 
         spin_unlock_irq(&ds1286_lock);
+        unlock_kernel();
         return 0;
 
 out_busy:
         spin_lock_irq(&ds1286_lock);
+        unlock_kernel();
         return -EBUSY;
 }