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>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index 3ef644a2e517..43a190738fee 100644
--- 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);