Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull core kernel fixes from Ingo Molnar:
 "This is a complex task_work series from Oleg that fixes the bug that
  this VFS commit tried to fix:

    d35abdb28824 hold task_lock around checks in keyctl

  but solves the problem without the lockup regression that d35abdb28824
  introduced in v3.6.

  This series came late in v3.6 and I did not feel confident about it so
  late in the cycle.  Might be worth backporting to -stable if it proves
  itself upstream."

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  task_work: Simplify the usage in ptrace_notify() and get_signal_to_deliver()
  task_work: Revert "hold task_lock around checks in keyctl"
  task_work: task_work_add() should not succeed after exit_task_work()
  task_work: Make task_work_add() lockless

1 files changed, 0 insertions, 2 deletions

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 3364fbf46807..6cfc6478863e 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1486,7 +1486,6 @@ long keyctl_session_to_parent(void)
         oldwork = NULL;
         parent = me->real_parent;
 
-        task_lock(parent);
         /* the parent mustn't be init and mustn't be a kernel thread */
         if (parent->pid <= 1 || !parent->mm)
                 goto unlock;
@@ -1530,7 +1529,6 @@ long keyctl_session_to_parent(void)
         if (!ret)
                 newwork = NULL;
 unlock:
-        task_unlock(parent);
         write_unlock_irq(&tasklist_lock);
         rcu_read_unlock();
         if (oldwork)