From 3cfd0885fac78c130a119ed576d18b5948fa2a5a Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Fri, 29 Sep 2006 02:00:41 -0700 Subject: [PATCH] [PATCH] tty: stop the tty vanishing under procfs access Signed-off-by: Alan Cox Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/proc/array.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/proc/array.c b/fs/proc/array.c index 0b615d62a159..c0e554971df0 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -347,6 +347,8 @@ static int do_task_stat(struct task_struct *task, char * buffer, int whole) sigemptyset(&sigign); sigemptyset(&sigcatch); cutime = cstime = utime = stime = cputime_zero; + + mutex_lock(&tty_mutex); read_lock(&tasklist_lock); if (task->sighand) { spin_lock_irq(&task->sighand->siglock); @@ -388,6 +390,7 @@ static int do_task_stat(struct task_struct *task, char * buffer, int whole) } ppid = pid_alive(task) ? task->group_leader->real_parent->tgid : 0; read_unlock(&tasklist_lock); + mutex_unlock(&tty_mutex); if (!whole || num_threads<2) wchan = get_wchan(task); -- 2.39.5