From ec66b8cf03e5a63de6332c989b0ceebe4ba2937e Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= Date: Mon, 11 Apr 2022 12:48:55 +0300 Subject: [PATCH] tty: Add function for handling flow control chars MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Move receive path flow control character handling to own function. No functional changes. Signed-off-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20220411094859.10894-2-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/n_tty.c | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-) diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index bdc314aeab88..88af1cdd2fd1 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -1220,21 +1220,28 @@ n_tty_receive_signal_char(struct tty_struct *tty, int signal, unsigned char c) process_echoes(tty); } +/* Returns true if c is consumed as flow-control character */ +static bool n_tty_receive_char_flow_ctrl(struct tty_struct *tty, unsigned char c) +{ + if (c == START_CHAR(tty)) { + start_tty(tty); + process_echoes(tty); + return true; + } + if (c == STOP_CHAR(tty)) { + stop_tty(tty); + return true; + } + + return false; +} + static void n_tty_receive_char_special(struct tty_struct *tty, unsigned char c) { struct n_tty_data *ldata = tty->disc_data; - if (I_IXON(tty)) { - if (c == START_CHAR(tty)) { - start_tty(tty); - process_echoes(tty); - return; - } - if (c == STOP_CHAR(tty)) { - stop_tty(tty); - return; - } - } + if (I_IXON(tty) && n_tty_receive_char_flow_ctrl(tty, c)) + return; if (L_ISIG(tty)) { if (c == INTR_CHAR(tty)) {