diff --git a/mod_hello.c b/mod_hello.c
index ff5f356..a4dc60e 100644
--- a/mod_hello.c
+++ b/mod_hello.c
@@ -25,13 +25,29 @@ hello_control_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
     return 0;
 }
 
+static int
+hello_control_open (struct inode *inode, struct file *filp)
+{
+    return 0;
+}
+
+static ssize_t
+hello_control_read (struct file *filp, char __user *buf, size_t size, loff_t *offp)
+{
+    int ret = 0;
+    return ret;
+}
+
 static const struct file_operations hello_ctl_fops = {
     .unlocked_ioctl = hello_control_ioctl,
     .compat_ioctl   = hello_control_ioctl,
     .owner          = THIS_MODULE,
     .llseek         = noop_llseek,
+    .open           = hello_control_open,
+    .read           = hello_control_read,
 };
 
+
 static struct miscdevice hello_misc = {
     .minor          = MISC_DYNAMIC_MINOR,
     .name           = "helloctl",
@@ -114,9 +130,7 @@ static int __init hello_init(void)
 
 static void __exit hello_cleanup(void)
 {
-    if (misc_deregister(&hello_misc) < 0) {
-        printk(KERN_INFO "[%s] misc_deregister failed for control device.\n", __this_module.name);
-    }
+    misc_deregister(&hello_misc);
     printk(KERN_INFO "[%s] module unloaded.\n", __this_module.name);
 }