Merge branch 'for-linus' of ssh://master.kernel.org/pub/scm/linux/kernel/git/ieee1394...

[linux-2.6-omap-h63xx.git] / fs / proc / array.c

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 25e917fb47399bf22761fb8ed47b190776ee6cff..07c9cdbcdcac6f6a2be5fa40f97a340b2f5980a4 100644 (file)
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -346,20 +346,13 @@ static int do_task_stat(struct task_struct *task, char * buffer, int whole)
        sigemptyset(&sigcatch);
        cutime = cstime = utime = stime = cputime_zero;
 
-       mutex_lock(&tty_mutex);
        rcu_read_lock();
        if (lock_task_sighand(task, &flags)) {
                struct signal_struct *sig = task->signal;
-               struct tty_struct *tty = sig->tty;
-
-               if (tty) {
-                       /*
-                        * sig->tty is not stable, but tty_mutex
-                        * protects us from release_dev(tty)
-                        */
-                       barrier();
-                       tty_pgrp = tty->pgrp;
-                       tty_nr = new_encode_dev(tty_devnum(tty));
+
+               if (sig->tty) {
+                       tty_pgrp = pid_nr(sig->tty->pgrp);
+                       tty_nr = new_encode_dev(tty_devnum(sig->tty));
                }
 
                num_threads = atomic_read(&sig->count);
@@ -388,14 +381,13 @@ static int do_task_stat(struct task_struct *task, char * buffer, int whole)
                        stime = cputime_add(stime, sig->stime);
                }
 
-               sid = sig->session;
+               sid = signal_session(sig);
                pgid = process_group(task);
                ppid = rcu_dereference(task->real_parent)->tgid;
 
                unlock_task_sighand(task, &flags);
        }
        rcu_read_unlock();
-       mutex_unlock(&tty_mutex);
 
        if (!whole || num_threads<2)
                wchan = get_wchan(task);