The change_speed() function set the baudrate of the device: so this function
should be serialized against multiple calls. Use the cfg_lock mutex to do this.
Signed-off-by: Alessio Igor Bogani <abogani@xxxxxxxxxx>
---
drivers/usb/serial/ftdi_sio.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 6af0dfa..963a70f 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1272,8 +1272,8 @@ 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);
@@ -2264,9 +2264,11 @@ 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);
--
1.6.3.3
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