diff options
| -rw-r--r-- | drivers/tty/n_tty.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c index 0e3efc1ed2d5..59eb444fe17c 100644 --- a/drivers/tty/n_tty.c +++ b/drivers/tty/n_tty.c @@ -231,6 +231,8 @@ static void n_tty_write_wakeup(struct tty_struct *tty) static inline void n_tty_check_throttle(struct tty_struct *tty) { + if (tty->driver->type == TTY_DRIVER_TYPE_PTY) + return; /* * Check the remaining room for the input canonicalization * mode. We don't want to throttle the driver if we're in @@ -250,6 +252,18 @@ static inline void n_tty_check_throttle(struct tty_struct *tty) static inline void n_tty_check_unthrottle(struct tty_struct *tty) { + if (tty->driver->type == TTY_DRIVER_TYPE_PTY && + tty->link->ldisc->ops->write_wakeup == n_tty_write_wakeup) { + if (chars_in_buffer(tty) > TTY_THRESHOLD_UNTHROTTLE) + return; + if (!tty->count) + return; + n_tty_set_room(tty); + n_tty_write_wakeup(tty->link); + wake_up_interruptible_poll(&tty->link->write_wait, POLLOUT); + return; + } + /* If there is enough space in the read buffer now, let the * low-level driver know. We use chars_in_buffer() to * check the buffer, as it now knows about canonical mode. |
