[Bluetooth] Code cleanup of the drivers source code

[pandora-kernel.git] / kernel / timer.c

diff --git a/kernel/timer.c b/kernel/timer.c
index b650f04..1d7dd62 100644 (file)
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -1324,46 +1324,19 @@ asmlinkage long sys_getpid(void)
 }
 
 /*
- * Accessing ->group_leader->real_parent is not SMP-safe, it could
- * change from under us. However, rather than getting any lock
- * we can use an optimistic algorithm: get the parent
- * pid, and go back and check that the parent is still
- * the same. If it has changed (which is extremely unlikely
- * indeed), we just try again..
- *
- * NOTE! This depends on the fact that even if we _do_
- * get an old value of "parent", we can happily dereference
- * the pointer (it was and remains a dereferencable kernel pointer
- * no matter what): we just can't necessarily trust the result
- * until we know that the parent pointer is valid.
- *
- * NOTE2: ->group_leader never changes from under us.
+ * Accessing ->real_parent is not SMP-safe, it could
+ * change from under us. However, we can use a stale
+ * value of ->real_parent under rcu_read_lock(), see
+ * release_task()->call_rcu(delayed_put_task_struct).
  */
 asmlinkage long sys_getppid(void)
 {
        int pid;
-       struct task_struct *me = current;
-       struct task_struct *parent;
 
-       parent = me->group_leader->real_parent;
-       for (;;) {
-               pid = parent->tgid;
-#if defined(CONFIG_SMP) || defined(CONFIG_PREEMPT)
-{
-               struct task_struct *old = parent;
+       rcu_read_lock();
+       pid = rcu_dereference(current->real_parent)->tgid;
+       rcu_read_unlock();
 
-               /*
-                * Make sure we read the pid before re-reading the
-                * parent pointer:
-                */
-               smp_rmb();
-               parent = me->group_leader->real_parent;
-               if (old != parent)
-                       continue;
-}
-#endif
-               break;
-       }
        return pid;
 }