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tty: Rework receive flow control char logic

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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: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220426144935.54893-2-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2022-04-26 17:49:33 +03:00 committed by Greg Kroah-Hartman
parent ef44c6c1e8
commit 25e02ba60f
1 changed files with 11 additions and 5 deletions
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16
drivers/tty/n_tty.c
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@ -1220,20 +1220,26 @@ 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_tty(tty);
return true;
}
return false;
/* STOP_CHAR */
stop_tty(tty);
return true;
}
static void n_tty_receive_char_special(struct tty_struct *tty, unsigned char c)