1 files changed, 4 insertions, 7 deletions

diff --git a/kernel/drivers/usb/gadget/function/u_serial.c b/kernel/drivers/usb/gadget/function/u_serial.c
index 7ee057930..f7771d86a 100644
--- a/kernel/drivers/usb/gadget/function/u_serial.c
+++ b/kernel/drivers/usb/gadget/function/u_serial.c
@@ -114,6 +114,7 @@ struct gs_port {
 	struct gs_buf		port_write_buf;
 	wait_queue_head_t	drain_wait;	/* wait while writes drain */
 	bool                    write_busy;
+	wait_queue_head_t	close_wait;
 
 	/* REVISIT this state ... */
 	struct usb_cdc_line_coding port_line_coding;	/* 8-N-1 etc */
@@ -876,7 +877,6 @@ static void gs_close(struct tty_struct *tty, struct file *file)
 	else
 		gs_buf_clear(&port->port_write_buf);
 
-	tty->driver_data = NULL;
 	port->port.tty = NULL;
 
 	port->openclose = false;
@@ -884,7 +884,7 @@ static void gs_close(struct tty_struct *tty, struct file *file)
 	pr_debug("gs_close: ttyGS%d (%p,%p) done!\n",
 			port->port_num, tty, file);
 
-	wake_up(&port->port.close_wait);
+	wake_up(&port->close_wait);
 exit:
 	spin_unlock_irq(&port->port_lock);
 }
@@ -1044,6 +1044,7 @@ gs_port_alloc(unsigned port_num, struct usb_cdc_line_coding *coding)
 	tty_port_init(&port->port);
 	spin_lock_init(&port->port_lock);
 	init_waitqueue_head(&port->drain_wait);
+	init_waitqueue_head(&port->close_wait);
 
 	tasklet_init(&port->push, gs_rx_push, (unsigned long) port);
 
@@ -1074,7 +1075,7 @@ static void gserial_free_port(struct gs_port *port)
 {
 	tasklet_kill(&port->push);
 	/* wait for old opens to finish */
-	wait_event(port->port.close_wait, gs_closed(port));
+	wait_event(port->close_wait, gs_closed(port));
 	WARN_ON(port->port_usb != NULL);
 	tty_port_destroy(&port->port);
 	kfree(port);
@@ -1224,7 +1225,6 @@ int gserial_connect(struct gserial *gser, u8 port_num)
 
 fail_out:
 	usb_ep_disable(gser->in);
-	gser->in->driver_data = NULL;
 	return status;
 }
 EXPORT_SYMBOL_GPL(gserial_connect);
@@ -1264,10 +1264,7 @@ void gserial_disconnect(struct gserial *gser)
 
 	/* disable endpoints, aborting down any active I/O */
 	usb_ep_disable(gser->out);
-	gser->out->driver_data = NULL;
-
 	usb_ep_disable(gser->in);
-	gser->in->driver_data = NULL;
 
 	/* finally, free any unused/unusable I/O buffers */
 	spin_lock_irqsave(&port->port_lock, flags);