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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2006-09-29 02:00:41 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-29 09:18:16 -0700
commit3cfd0885fac78c130a119ed576d18b5948fa2a5a (patch)
tree9a49ab330a39fc32cff3208038f1cef7763780aa
parent808a0d389ff8d85017ec811085a6083394c02caf (diff)
[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>
-rw-r--r--fs/proc/array.c3
1 files changed, 3 insertions, 0 deletions
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);