Commit 25e02ba6 authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by Greg Kroah-Hartman
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tty: Rework receive flow control char logic 



Add a helper to check if the character is a flow control one. This
rework prepares for adding lookahead done check cleanly to
n_tty_receive_char_flow_ctrl() between n_tty_is_char_flow_ctrl() and
the actions taken on the flow control characters.

No functional changes intended.

Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220426144935.54893-2-ilpo.jarvinen@linux.intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ef44c6c1

drivers/tty/n_tty.c

+11 −5
Original line number Diff line number Diff line
@@ -1220,22 +1220,28 @@ n_tty_receive_signal_char(struct tty_struct *tty, int signal, unsigned char c) 
		process_echoes(tty);

}



static bool n_tty_is_char_flow_ctrl(struct tty_struct *tty, unsigned char c)

{

	return c == START_CHAR(tty) || c == STOP_CHAR(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 (!n_tty_is_char_flow_ctrl(tty, c))

		return false;



	if (c == START_CHAR(tty)) {

		start_tty(tty);

		process_echoes(tty);

		return true;

	}

	if (c == STOP_CHAR(tty)) {



	/* STOP_CHAR */

	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;