Merge branch 'ptrace' of git://git.kernel.org/pub/scm/linux/kernel/git/oleg/misc
[linux-2.6.git] / kernel / signal.c
index c34f8f8..d7f70ae 100644 (file)
@@ -1251,18 +1251,25 @@ struct sighand_struct *__lock_task_sighand(struct task_struct *tsk,
 {
        struct sighand_struct *sighand;
 
-       rcu_read_lock();
        for (;;) {
+               local_irq_save(*flags);
+               rcu_read_lock();
                sighand = rcu_dereference(tsk->sighand);
-               if (unlikely(sighand == NULL))
+               if (unlikely(sighand == NULL)) {
+                       rcu_read_unlock();
+                       local_irq_restore(*flags);
                        break;
+               }
 
-               spin_lock_irqsave(&sighand->siglock, *flags);
-               if (likely(sighand == tsk->sighand))
+               spin_lock(&sighand->siglock);
+               if (likely(sighand == tsk->sighand)) {
+                       rcu_read_unlock();
                        break;
-               spin_unlock_irqrestore(&sighand->siglock, *flags);
+               }
+               spin_unlock(&sighand->siglock);
+               rcu_read_unlock();
+               local_irq_restore(*flags);
        }
-       rcu_read_unlock();
 
        return sighand;
 }
@@ -2474,7 +2481,7 @@ int sigprocmask(int how, sigset_t *set, sigset_t *oldset)
 /**
  *  sys_rt_sigprocmask - change the list of currently blocked signals
  *  @how: whether to add, remove, or set signals
- *  @set: stores pending signals
+ *  @nset: stores pending signals
  *  @oset: previous value of signal mask if non-null
  *  @sigsetsize: size of sigset_t type
  */