PATCH: Stop the tty vanishing under procfs access

[Alan Cox <alan@lxorguk.ukuu.org.uk>]

Would appreciate people double checking this one.

Signed-off-by: Alan Cox <alan@redhat.com>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.18-rc4-mm1/fs/proc/array.c linux-2.6.18-rc4-mm1/fs/proc/array.c
--- linux.vanilla-2.6.18-rc4-mm1/fs/proc/array.c	2006-08-15 15:39:31.000000000 +0100
+++ linux-2.6.18-rc4-mm1/fs/proc/array.c	2006-08-15 16:02:56.000000000 +0100
@@ -347,6 +347,8 @@
 	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 @@
 	}
 	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);

-
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