From 3f40f5b2a22110754ce469f5722bade8aeb241e5 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Wed, 5 Nov 2014 12:40:05 -0500 Subject: [PATCH] tty: Flush tty buffers after hardware shutdown The line discipline buffer and the tty buffers must be flushed again after hardware shutdown; otherwise, a brief window exists between the ldisc flush in tty_port_close_start() and the subsequent tty_port_shutdown(), during which more data could be received into the tty buffers. A racing open might then be able to receive data from the previous session. Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/tty_port.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c index 3b641d115fd2..4d9abaa81be4 100644 --- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -520,6 +520,7 @@ void tty_port_close_end(struct tty_port *port, struct tty_struct *tty) { unsigned long flags; + tty_ldisc_flush(tty); tty->closing = 0; spin_lock_irqsave(&port->lock, flags);