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[PATCH] tty: stop the tty vanishing under procfs access 

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alan Cox 2006-09-29 02:00:41 -07:00 committed by Linus Torvalds
parent 808a0d389f
commit 3cfd0885fa
1 changed files with 3 additions and 0 deletions
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3
fs/proc/array.c
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@ -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);