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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>
This commit is contained in:
Ilpo Järvinen 2022-04-11 12:48:55 +03:00 committed by Greg Kroah-Hartman
parent b0e0bd9d0d
commit ec66b8cf03
1 changed files with 18 additions and 11 deletions
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29
drivers/tty/n_tty.c
View File

@ -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)) {