tty: tty_port: Add IO_ERROR bit handling

To propogate tty_port_open/close to a few other devices we need to start
handling the IO_ERROR flag on the tty. We can do this pretty trivially.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index 3ef644a..43a1907 100644 (file)
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -122,8 +122,10 @@ void tty_port_hangup(struct tty_port *port)
        spin_lock_irqsave(&port->lock, flags);
        port->count = 0;
        port->flags &= ~ASYNC_NORMAL_ACTIVE;
-       if (port->tty)
+       if (port->tty) {
+               set_bit(TTY_IO_ERROR, &port->tty->flags);
                tty_kref_put(port->tty);
+       }
        port->tty = NULL;
        spin_unlock_irqrestore(&port->lock, flags);
        wake_up_interruptible(&port->open_wait);
@@ -383,6 +385,7 @@ void tty_port_close(struct tty_port *port, struct tty_struct *tty,
        if (tty_port_close_start(port, tty, filp) == 0)
                return;
        tty_port_shutdown(port);
+       set_bit(TTY_IO_ERROR, &tty->flags);
        tty_port_close_end(port, tty);
        tty_port_tty_set(port, NULL);
 }
@@ -414,6 +417,7 @@ int tty_port_open(struct tty_port *port, struct tty_struct *tty,
                        }
                }
                set_bit(ASYNCB_INITIALIZED, &port->flags);
+               clear_bit(TTY_IO_ERROR, &tty->flags);
        }
        mutex_unlock(&port->mutex);
        return tty_port_block_til_ready(port, tty, filp);