diff options
Diffstat (limited to 'drivers/tty/tty_port.c')
| -rw-r--r-- | drivers/tty/tty_port.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c index 880608a65773..dce08a6d7b5e 100644 --- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -43,6 +43,26 @@ static int tty_port_default_receive_buf(struct tty_port *port, return ret; } +static void tty_port_default_lookahead_buf(struct tty_port *port, const unsigned char *p, + const unsigned char *f, unsigned int count) +{ + struct tty_struct *tty; + struct tty_ldisc *disc; + + tty = READ_ONCE(port->itty); + if (!tty) + return; + + disc = tty_ldisc_ref(tty); + if (!disc) + return; + + if (disc->ops->lookahead_buf) + disc->ops->lookahead_buf(disc->tty, p, f, count); + + tty_ldisc_deref(disc); +} + static void tty_port_default_wakeup(struct tty_port *port) { struct tty_struct *tty = tty_port_tty_get(port); @@ -55,6 +75,7 @@ static void tty_port_default_wakeup(struct tty_port *port) const struct tty_port_client_operations tty_port_default_client_ops = { .receive_buf = tty_port_default_receive_buf, + .lookahead_buf = tty_port_default_lookahead_buf, .write_wakeup = tty_port_default_wakeup, }; EXPORT_SYMBOL_GPL(tty_port_default_client_ops); |