diff options
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index b72fa49eb257..e4eca7810bcf 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -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, |