1 files changed, 8 insertions, 7 deletions

diff --git a/drivers/char/dtlk.c b/drivers/char/dtlk.c
index 045c930e6320..e3859d4eaead 100644
--- a/drivers/char/dtlk.c
+++ b/drivers/char/dtlk.c
@@ -93,8 +93,8 @@ static ssize_t dtlk_write(struct file *, const char __user *,
 static unsigned int dtlk_poll(struct file *, poll_table *);
 static int dtlk_open(struct inode *, struct file *);
 static int dtlk_release(struct inode *, struct file *);
-static int dtlk_ioctl(struct inode *inode, struct file *file,
-                      unsigned int cmd, unsigned long arg);
+static long dtlk_ioctl(struct file *file,
+                       unsigned int cmd, unsigned long arg);
 
 static const struct file_operations dtlk_fops =
 {
@@ -102,7 +102,7 @@ static const struct file_operations dtlk_fops =
         .read           = dtlk_read,
         .write          = dtlk_write,
         .poll           = dtlk_poll,
-        .ioctl          = dtlk_ioctl,
+        .unlocked_ioctl = dtlk_ioctl,
         .open           = dtlk_open,
         .release        = dtlk_release,
 };
@@ -263,10 +263,9 @@ static void dtlk_timer_tick(unsigned long data)
         wake_up_interruptible(&dtlk_process_list);
 }
 
-static int dtlk_ioctl(struct inode *inode,
-                      struct file *file,
-                      unsigned int cmd,
-                      unsigned long arg)
+static long dtlk_ioctl(struct file *file,
+                       unsigned int cmd,
+                       unsigned long arg)
 {
         char __user *argp = (char __user *)arg;
         struct dtlk_settings *sp;
@@ -276,7 +275,9 @@ static int dtlk_ioctl(struct inode *inode,
         switch (cmd) {
 
         case DTLK_INTERROGATE:
+                lock_kernel();
                 sp = dtlk_interrogate();
+                unlock_kernel();
                 if (copy_to_user(argp, sp, sizeof(struct dtlk_settings)))
                         return -EINVAL;
                 return 0;