{
struct sem_undo *un;
- list_for_each_entry_rcu(un, &ulp->list_proc, list_proc) {
+ list_for_each_entry_rcu(un, &ulp->list_proc, list_proc,
+ spin_is_locked(&ulp->lock)) {
if (un->semid == semid)
return un;
}
ipc_assert_locked_object(&sma->sem_perm);
list_del(&un->list_id);
- /* we are the last process using this ulp, acquiring ulp->lock
- * isn't required. Besides that, we are also protected against
- * IPC_RMID as we hold sma->sem_perm lock now
- */
+ spin_lock(&ulp->lock);
list_del_rcu(&un->list_proc);
+ spin_unlock(&ulp->lock);
/* perform adjustments registered in un */
for (i = 0; i < sma->sem_nsems; i++) {