Revert "ipc,sem: remove uneeded sem_undo_list lock usage in exit_sem()"

[sfrench/cifs-2.6.git] / ipc / sem.c

diff --git a/ipc/sem.c b/ipc/sem.c
index 4f4303f320776cfb0b7f8de192d9f43e72a34087..3687b71151b3921860613dcc7089fa2831f6237e 100644 (file)
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -2384,11 +2384,9 @@ void exit_sem(struct task_struct *tsk)
                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++) {