diff options
| -rw-r--r-- | drivers/usb/serial/ftdi_sio.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c index 6fc09dc3b53..1d7c4fac02e 100644 --- a/drivers/usb/serial/ftdi_sio.c +++ b/drivers/usb/serial/ftdi_sio.c @@ -91,7 +91,7 @@ struct ftdi_private { unsigned long tx_outstanding_bytes; unsigned long tx_outstanding_urbs; unsigned short max_packet_size; - struct mutex cfg_lock; /* Avoid mess by parallel calls of config ioctl() */ + struct mutex cfg_lock; /* Avoid mess by parallel calls of config ioctl() and change_speed() */ }; /* struct ftdi_sio_quirk is used by devices requiring special attention. */ @@ -1273,8 +1273,8 @@ check_and_exit: (priv->flags & ASYNC_SPD_MASK)) || (((priv->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST) && (old_priv.custom_divisor != priv->custom_divisor))) { - mutex_unlock(&priv->cfg_lock); change_speed(tty, port); + mutex_unlock(&priv->cfg_lock); } else mutex_unlock(&priv->cfg_lock); @@ -2265,9 +2265,11 @@ static void ftdi_set_termios(struct tty_struct *tty, clear_mctrl(port, TIOCM_DTR | TIOCM_RTS); } else { /* set the baudrate determined before */ + mutex_lock(&priv->cfg_lock); if (change_speed(tty, port)) dev_err(&port->dev, "%s urb failed to set baudrate\n", __func__); + mutex_unlock(&priv->cfg_lock); /* Ensure RTS and DTR are raised when baudrate changed from 0 */ if (!old_termios || (old_termios->c_cflag & CBAUD) == B0) set_mctrl(port, TIOCM_DTR | TIOCM_RTS); |