TTY: add tty_port_tty_hangup helper

It allows for cleaning up on a considerable amount of places. They did
port_get, hangup, kref_put. Now the only thing needed is to call
tty_port_tty_hangup which does exactly that. And they can also decide
whether to consider CLOCAL or completely ignore that.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 5 deletions

diff --git a/drivers/tty/n_gsm.c b/drivers/tty/n_gsm.c
index 4a43ef5d7962..74d9a0258d7c 100644
--- a/drivers/tty/n_gsm.c
+++ b/drivers/tty/n_gsm.c
@@ -1418,11 +1418,7 @@ static void gsm_dlci_close(struct gsm_dlci *dlci)
                 pr_debug("DLCI %d goes closed.\n", dlci->addr);
         dlci->state = DLCI_CLOSED;
         if (dlci->addr != 0) {
-                struct tty_struct  *tty = tty_port_tty_get(&dlci->port);
-                if (tty) {
-                        tty_hangup(tty);
-                        tty_kref_put(tty);
-                }
+                tty_port_tty_hangup(&dlci->port, false);
                 kfifo_reset(dlci->fifo);
         } else
                 dlci->gsm->dead = 1;