Merge branch 'master' into for-linus

1 files changed, 12 insertions, 6 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index e3861b21e776..e4eca7810bcf 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -609,9 +609,9 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
 
 	acm->throttle = 0;
 
-	tasklet_schedule(&acm->urb_task);
 	set_bit(ASYNCB_INITIALIZED, &acm->port.flags);
 	rv = tty_port_block_til_ready(&acm->port, tty, filp);
+	tasklet_schedule(&acm->urb_task);
 done:
 	mutex_unlock(&acm->mutex);
 err_out:
@@ -686,15 +686,21 @@ static void acm_tty_close(struct tty_struct *tty, struct file *filp)
 
 	/* Perform the closing process and see if we need to do the hardware
 	   shutdown */
-	if (!acm || tty_port_close_start(&acm->port, tty, filp) == 0)
+	if (!acm)
+		return;
+	if (tty_port_close_start(&acm->port, tty, filp) == 0) {
+		mutex_lock(&open_mutex);
+		if (!acm->dev) {
+			tty_port_tty_set(&acm->port, NULL);
+			acm_tty_unregister(acm);
+			tty->driver_data = NULL;
+		}
+		mutex_unlock(&open_mutex);
 		return;
+	}
 	acm_port_down(acm, 0);
 	tty_port_close_end(&acm->port, tty);
-	mutex_lock(&open_mutex);
 	tty_port_tty_set(&acm->port, NULL);
-	if (!acm->dev)
-		acm_tty_unregister(acm);
-	mutex_unlock(&open_mutex);
 }
 
 static int acm_tty_write(struct tty_struct *tty,