task_work: Revert "hold task_lock around checks in keyctl"
This reverts commit d35abdb28824cf74f0a106a0f9c6f3ff700a35bf.
task_lock() was added to ensure exit_mm() and thus exit_task_work() is
not possible before task_work_add().
This is wrong, task_lock() must not be nested with write_lock(tasklist).
And this is no longer needed, task_work_add() now fails if it is called
after exit_task_work().
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20120826191214.GA4231@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 3364fbf..6cfc647 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1486,7 +1486,6 @@
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 @@
if (!ret)
newwork = NULL;
unlock:
- task_unlock(parent);
write_unlock_irq(&tasklist_lock);
rcu_read_unlock();
if (oldwork)