From e2613be5093d04e6589924d36a1e363eef3c87c7 Mon Sep 17 00:00:00 2001 From: Peter Hurley Date: Tue, 11 Feb 2014 16:34:55 -0500 Subject: [PATCH] n_tty: Fix stale echo output When echoes cannot be flushed to output (usually because the tty has no more write room) and L_ECHO is subsequently turned off, then when L_ECHO is turned back on, stale echoes are output. Output completed echoes regardless of the L_ECHO setting: 1. before normal writes to that tty 2. if the tty was stopped by soft flow control and is being restarted Reported-by: Mikulas Patocka Cc: # 3.13.x Signed-off-by: Peter Hurley Signed-off-by: Greg Kroah-Hartman --- drivers/tty/n_tty.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index 2747a3b..d15624c 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -817,8 +817,7 @@ static void process_echoes(struct tty_struct *tty) struct n_tty_data *ldata = tty->disc_data; size_t echoed; - if ((!L_ECHO(tty) && !L_ECHONL(tty)) || - ldata->echo_mark == ldata->echo_tail) + if (ldata->echo_mark == ldata->echo_tail) return; mutex_lock(&ldata->output_lock); @@ -1244,7 +1243,8 @@ n_tty_receive_signal_char(struct tty_struct *tty, int signal, unsigned char c) if (L_ECHO(tty)) { echo_char(c, tty); commit_echoes(tty); - } + } else + process_echoes(tty); isig(signal, tty); return; } @@ -1274,7 +1274,7 @@ n_tty_receive_char_special(struct tty_struct *tty, unsigned char c) if (I_IXON(tty)) { if (c == START_CHAR(tty)) { start_tty(tty); - commit_echoes(tty); + process_echoes(tty); return 0; } if (c == STOP_CHAR(tty)) { @@ -1820,8 +1820,10 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old) * Fix tty hang when I_IXON(tty) is cleared, but the tty * been stopped by STOP_CHAR(tty) before it. */ - if (!I_IXON(tty) && old && (old->c_iflag & IXON) && !tty->flow_stopped) + if (!I_IXON(tty) && old && (old->c_iflag & IXON) && !tty->flow_stopped) { start_tty(tty); + process_echoes(tty); + } /* The termios change make the tty ready for I/O */ if (waitqueue_active(&tty->write_wait)) -- 2.7.4