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Subject[PATCH] tty:pty: move wake_up*() after tty_vhangup() in pty_close()
Date
wake_up_interruptible() may wake up the session leader blocked on pts, at
this time the tty_signal_session_leader() in __tty_hangup() has not been
executed.

The session leader's subsequent IO on pts will fail, but the session
leader did not received SIGHUP as expected at this time.

A observed phenomenon is that when the ssh connection is disconnected, the
background jobs managed by bash did not terminate as expected. This
problem is more easily observed on low-end single-processor systems.

Signed-off-by: Yan Cangang <nalanzeyu@gmail.com>
---
drivers/tty/pty.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
index 07394fdaf522..fbcf2caa8fc1 100644
--- a/drivers/tty/pty.c
+++ b/drivers/tty/pty.c
@@ -64,8 +64,6 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
if (!tty->link)
return;
set_bit(TTY_OTHER_CLOSED, &tty->link->flags);
- wake_up_interruptible(&tty->link->read_wait);
- wake_up_interruptible(&tty->link->write_wait);
if (tty->driver->subtype == PTY_TYPE_MASTER) {
set_bit(TTY_OTHER_CLOSED, &tty->flags);
#ifdef CONFIG_UNIX98_PTYS
@@ -78,6 +76,8 @@ static void pty_close(struct tty_struct *tty, struct file *filp)
#endif
tty_vhangup(tty->link);
}
+ wake_up_interruptible(&tty->link->read_wait);
+ wake_up_interruptible(&tty->link->write_wait);
}

/*
--
2.30.2
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