[kernel] spin_lock 과 module_exit

spinlock_t lock;
struct task_struct *th_id;
 
static int thr_spin_lock(void *arg)
{
  int data=0;
  spin_lock(&lock);
  ssleep(10);
  spin_unlock(&lock);
 
  return 0;
}
 
 
static int __init lock_init(void)
{
  th_id = (struct task_struct *)kthread_run(thr_spin_lock, NULL, "TEST");
  return 0;
}
 
static void __exit lock_release(void)
{
RETRY:
  if(spin_is_locked(&lock)){
    msleep(1000);
    goto RETRY:
  }
 
  kthread_stop(th_id);
}