static int x25_asy_open_tty(struct tty_struct *tty)
{
struct x25_asy *sl;
int err;
if (tty->ops->write == NULL)
return -EOPNOTSUPP;
/* OK. Find a free X.25 channel to use. */
sl = x25_asy_alloc();
if (sl == NULL)
return -ENFILE;
sl->tty = tty;
tty->disc_data = sl;
tty->receive_room = 65536;
tty_driver_flush_buffer(tty);
tty_ldisc_flush(tty);
/* Restore default settings */
sl->dev->type = ARPHRD_X25;
/* Perform the low-level X.25 async init */
err = x25_asy_open(sl->dev);
if (err) {
x25_asy_free(sl);
return err;
}
/* Done. We have linked the TTY line to a channel. */
return 0;
}
/*
* Close down an X.25 channel.
* This means flushing out any pending queues, and then restoring the
* TTY line discipline to what it was before it got hooked to X.25
* (which usually is TTY again).
*/
static void x25_asy_close_tty(struct tty_struct *tty)
{
struct x25_asy *sl = tty->disc_data;
/* First make sure we're connected. */
if (!sl || sl->magic != X25_ASY_MAGIC)
return;
rtnl_lock();
if (sl->dev->flags & IFF_UP)
dev_close(sl->dev);
rtnl_unlock();
tty->disc_data = NULL;
sl->tty = NULL;
x25_asy_free(sl);
}
/*
* Close down an X.25 channel.
* This means flushing out any pending queues, and then restoring the
* TTY line discipline to what it was before it got hooked to X.25
* (which usually is TTY again).
*/
static void x25_asy_close_tty(struct tty_struct *tty)
{
struct x25_asy *sl = (struct x25_asy *) tty->disc_data;
/* First make sure we're connected. */
if (!sl || sl->magic != X25_ASY_MAGIC)
return;
if (sl->dev->flags & IFF_UP)
{
(void) dev_close(sl->dev);
}
tty->disc_data = 0;
sl->tty = NULL;
x25_asy_free(sl);
unregister_netdev(sl->dev);
MOD_DEC_USE_COUNT;
}
/*
* Close down an X.25 channel.
* This means flushing out any pending queues, and then restoring the
* TTY line discipline to what it was before it got hooked to X.25
* (which usually is TTY again).
*/
static void x25_asy_close_tty(struct tty_struct *tty)
{
struct x25_asy *sl = tty->disc_data;
int err;
/* First make sure we're connected. */
if (!sl || sl->magic != X25_ASY_MAGIC)
return;
rtnl_lock();
if (sl->dev->flags & IFF_UP)
dev_close(sl->dev);
rtnl_unlock();
err = lapb_unregister(sl->dev);
if (err != LAPB_OK)
pr_err("x25_asy_close: lapb_unregister error: %d\n",
err);
tty->disc_data = NULL;
sl->tty = NULL;
x25_asy_free(sl);
}