Add kref to fake tty used by USB console

We alloc a fake tty in usb serial console setup function. we should
init the tty's kref otherwise we will face WARN_ON after following
invoke of tty_port_tty_set --> tty_kref_get.

Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
index 5b20de1..5b95009 100644 (file)
--- a/drivers/usb/serial/console.c
+++ b/drivers/usb/serial/console.c
@@ -135,6 +135,7 @@ static int usb_console_setup(struct console *co, char *options)
                                err("no more memory");
                                goto reset_open_count;
                        }
+                       kref_init(&tty->kref);
                        termios = kzalloc(sizeof(*termios), GFP_KERNEL);
                        if (!termios) {
                                retval = -ENOMEM;