From 36bce0b1049a8a6e615f2a39365d29c507680f09 Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Sun, 22 Apr 2018 13:33:46 +0100 Subject: [PATCH] serial: mvebu-uart: Fix local flags handling on termios update Commit fea9afbeba20 reworked the baud rate selection, but also added a (not so) subtle change in the way the local flags (c_lflag in the termios structure) are handled, forcing the new flags to always be the same as the old ones. The reason for that particular change is both obscure and undocumented. It also completely breaks userspace. Something as trivial as getty is unusable: Debian GNU/Linux 9 sy-borg ttyMV0 sy-borg login: root root [timeout] Debian GNU/Linux 9 sy-borg ttyMV0 which is quite obvious in retrospect: getty cannot get in control of the echo mode, is stuck in canonical mode, and times out without ever seeing anything valid. It also begs the question of how this change was ever tested. The fix is pretty obvious: stop messing with c_lflag, and the world will be a happier place. Cc: stable@vger.kernel.org # 4.15+ Fixes: fea9afbeba20 ("serial: mvebu-uart: add function to change baudrate") Signed-off-by: Marc Zyngier Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/mvebu-uart.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index 750e5645dc857..f503fab1e2685 100644 --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -495,7 +495,6 @@ static void mvebu_uart_set_termios(struct uart_port *port, termios->c_iflag |= old->c_iflag & ~(INPCK | IGNPAR); termios->c_cflag &= CREAD | CBAUD; termios->c_cflag |= old->c_cflag & ~(CREAD | CBAUD); - termios->c_lflag = old->c_lflag; } spin_unlock_irqrestore(&port->lock, flags); -- 2.39.5