caif: tty's are kref objects so take a reference

I don't think this can be abused in this case but do things properly.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/net/caif/caif_serial.c b/drivers/net/caif/caif_serial.c
index c669ec37483b..38c0186cfbc2 100644
--- a/drivers/net/caif/caif_serial.c
+++ b/drivers/net/caif/caif_serial.c
@@ -319,7 +319,7 @@ static int ldisc_open(struct tty_struct *tty)
         sprintf(name, "cf%s", tty->name);
         dev = alloc_netdev(sizeof(*ser), name, caifdev_setup);
         ser = netdev_priv(dev);
-        ser->tty = tty;
+        ser->tty = tty_kref_get(tty);
         ser->dev = dev;
         debugfs_init(ser, tty);
         tty->receive_room = N_TTY_BUF_SIZE;
@@ -352,6 +352,7 @@ static void ldisc_close(struct tty_struct *tty)
         unregister_netdevice(ser->dev);
         list_del(&ser->node);
         debugfs_deinit(ser);
+        tty_kref_put(ser->tty);
         if (!islocked)
                 rtnl_unlock();
 }