1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/char/nvram.c b/drivers/char/nvram.c
index 98dec380af49..197cd7a0c332 100644
--- a/drivers/char/nvram.c
+++ b/drivers/char/nvram.c
@@ -107,6 +107,7 @@
 #include <linux/init.h>
 #include <linux/proc_fs.h>
 #include <linux/spinlock.h>
+#include <linux/smp_lock.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
@@ -333,12 +334,14 @@ nvram_ioctl(struct inode *inode, struct file *file,
 static int
 nvram_open(struct inode *inode, struct file *file)
 {
+        lock_kernel();
         spin_lock(&nvram_state_lock);
 
         if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
             (nvram_open_mode & NVRAM_EXCL) ||
             ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) {
                 spin_unlock(&nvram_state_lock);
+                unlock_kernel();
                 return -EBUSY;
         }
 
@@ -349,6 +352,7 @@ nvram_open(struct inode *inode, struct file *file)
         nvram_open_cnt++;
 
         spin_unlock(&nvram_state_lock);
+        unlock_kernel();
 
         return 0;
 }