From: Peter Hurley Date: Wed, 5 Nov 2014 17:40:05 +0000 (-0500) Subject: tty: Flush tty buffers after hardware shutdown X-Git-Tag: firefly_0821_release~176^2~2678^2~75 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3f40f5b2a22110754ce469f5722bade8aeb241e5;p=firefly-linux-kernel-4.4.55.git 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 --- 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);