diff options
| author |   Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2022-04-11 12:48:55 +0300 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-22 16:30:41 +0200 |
| commit | ec66b8cf03e5a63de6332c989b0ceebe4ba2937e (patch) | |
| tree | 59d0349f8dbd603361ff58a572a73f79726bad8a /drivers/tty/n_tty.c | |
| parent | serial: core: fix tcdrain() with CTS enabled (diff) | |
| download | linux-dev-ec66b8cf03e5a63de6332c989b0ceebe4ba2937e.tar.xz linux-dev-ec66b8cf03e5a63de6332c989b0ceebe4ba2937e.zip | |
tty: Add function for handling flow control chars
Move receive path flow control character handling to own function.
No functional changes.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220411094859.10894-2-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/n_tty.c')
| -rw-r--r-- | drivers/tty/n_tty.c | 29 |
1 files 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)) { |