tree b68c26beba44e1e138da1b621b1d48ab153f9199
parent cdc623300841bc8f1625c320d5a6cbc52c43c60d
author Eric W. Biederman <ebiederm@xmission.com> 1171270372 -0800
committer Linus Torvalds <torvalds@woody.linux-foundation.org> 1171302511 -0800

[PATCH] tty: clarify disassociate_ctty

The code to look at tty_old_pgrp and send SIGHUP and SIGCONT when it is
present only executes when disassociate_ctty is called from do_exit.  Make
this clear by adding an explict on_exit check, and explicitly setting
tty_old_pgrp to 0.

In addition fix the locking by reading tty_old_pgrp under the siglock.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>