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tty: Fix hangup race with TIOCSETD ioctl

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The hangup may already have happened; check for that state also.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2013-06-15 07:04:50 -04:00 committed by Greg Kroah-Hartman
parent 9fbfa34c18
commit e97733ca67
1 changed files with 2 additions and 4 deletions
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6
drivers/tty/tty_ldisc.c
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@ -546,10 +546,8 @@ int tty_set_ldisc(struct tty_struct *tty, int ldisc)
old_ldisc = tty->ldisc;
tty_lock(tty);
/* FIXME: for testing only */
WARN_ON(test_bit(TTY_HUPPED, &tty->flags));
if (test_bit(TTY_HUPPING, &tty->flags)) {
if (test_bit(TTY_HUPPING, &tty->flags) ||
test_bit(TTY_HUPPED, &tty->flags)) {
/* We were raced by the hangup method. It will have stomped
the ldisc data and closed the ldisc down */
tty_ldisc_enable_pair(tty, o_tty);