1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/char/synclink.c b/drivers/char/synclink.c
index fadab1d9510f..1c9c440f59ce 100644
--- a/drivers/char/synclink.c
+++ b/drivers/char/synclink.c
@@ -2942,6 +2942,7 @@ static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
                     unsigned int cmd, unsigned long arg)
 {
         struct mgsl_struct * info = (struct mgsl_struct *)tty->driver_data;
+        int ret;
         
         if (debug_level >= DEBUG_LEVEL_INFO)
                 printk("%s(%d):mgsl_ioctl %s cmd=%08X\n", __FILE__,__LINE__,
@@ -2956,7 +2957,10 @@ static int mgsl_ioctl(struct tty_struct *tty, struct file * file,
                     return -EIO;
         }
 
-        return mgsl_ioctl_common(info, cmd, arg);
+        lock_kernel();
+        ret = mgsl_ioctl_common(info, cmd, arg);
+        unlock_kernel();
+        return ret;
 }
 
 static int mgsl_ioctl_common(struct mgsl_struct *info, unsigned int cmd, unsigned long arg)