1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/char/genrtc.c b/drivers/char/genrtc.c
index 69f0a2993af0..aac0985a572b 100644
--- a/drivers/char/genrtc.c
+++ b/drivers/char/genrtc.c
@@ -51,6 +51,7 @@
 #include <linux/init.h>
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
 #include <linux/workqueue.h>
 
 #include <asm/uaccess.h>
@@ -338,12 +339,16 @@ static int gen_rtc_ioctl(struct inode *inode, struct file *file,
 
 static int gen_rtc_open(struct inode *inode, struct file *file)
 {
-        if (gen_rtc_status & RTC_IS_OPEN)
+        lock_kernel();
+        if (gen_rtc_status & RTC_IS_OPEN) {
+                unlock_kernel();
                 return -EBUSY;
+        }
 
         gen_rtc_status |= RTC_IS_OPEN;
         gen_rtc_irq_data = 0;
         irq_active = 0;
+        unlock_kernel();
 
         return 0;
 }