diff options
| -rw-r--r-- | drivers/usb/serial/ftdi_sio.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index aab567644b9..0ab8474b00c 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -56,6 +56,7 @@ static __u16 vendor = FTDI_VID; static __u16 product; struct ftdi_private { + struct kref kref; ftdi_chip_type_t chip_type; /* type of device, either SIO or FT8U232AM */ int baud_base; /* baud base clock for divisor setting */ @@ -1354,6 +1355,7 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port) return -ENOMEM; } + kref_init(&priv->kref); spin_lock_init(&priv->rx_lock); spin_lock_init(&priv->tx_lock); init_waitqueue_head(&priv->delta_msr_wait); @@ -1470,6 +1472,13 @@ static void ftdi_shutdown(struct usb_serial *serial) dbg("%s", __func__); } +static void ftdi_sio_priv_release(struct kref *k) +{ + struct ftdi_private *priv = container_of(k, struct ftdi_private, kref); + + kfree(priv); +} + static int ftdi_sio_port_remove(struct usb_serial_port *port) { struct ftdi_private *priv = usb_get_serial_port_data(port); @@ -1484,7 +1493,7 @@ static int ftdi_sio_port_remove(struct usb_serial_port *port) if (priv) { usb_set_serial_port_data(port, NULL); - kfree(priv); + kref_put(&priv->kref, ftdi_sio_priv_release); } return 0; @@ -1549,7 +1558,8 @@ static int ftdi_open(struct tty_struct *tty, dev_err(&port->dev, "%s - failed submitting read urb, error %d\n", __func__, result); - + else + kref_get(&priv->kref); return result; } /* ftdi_open */ @@ -1591,11 +1601,11 @@ static void ftdi_close(struct tty_struct *tty, mutex_unlock(&port->serial->disc_mutex); /* cancel any scheduled reading */ - cancel_delayed_work(&priv->rx_work); - flush_scheduled_work(); + cancel_delayed_work_sync(&priv->rx_work); /* shutdown our bulk read */ usb_kill_urb(port->read_urb); + kref_put(&priv->kref, ftdi_sio_priv_release); } /* ftdi_close */ |