USB: gadget: Hangup tty on g_serial disconnect

On USB cable disconnect g_serial doesn't hangup the port tty,
which results in an endless read on the tty device. With the
following patch the read and select behave correctly when
the cable is unplugged.

Tested on at91rm9200

Signed-off-by: Savin Zlobec <savin@epiko.si>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/serial.c b/drivers/usb/gadget/serial.c
index f5c3896b1d959a5cbf66e705ba21038ef51553e5..433b3f44f42e2dc36e38e2b7dc85be3e48b3785a 100644 (file)
--- a/drivers/usb/gadget/serial.c
+++ b/drivers/usb/gadget/serial.c
@@ -2163,8 +2163,7 @@ static void gs_free_ports(struct gs_dev *dev)
                                port->port_dev = NULL;
                                wake_up_interruptible(&port->port_write_wait);
                                if (port->port_tty) {
-                                       wake_up_interruptible(&port->port_tty->read_wait);
-                                       wake_up_interruptible(&port->port_tty->write_wait);
+                                       tty_hangup(port->port_tty);
                                }
                                spin_unlock_irqrestore(&port->port_lock, flags);
                        } else {