USB: cp210x: initialise baud rate at open

The newer cp2104 devices require the baud rate to be initialised after
power on. Make sure it is set when port is opened.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Cc: Preston Fick <preston.fick@silabs.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 2d2d23933ba6..5c3e8592fd22 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -417,6 +417,10 @@ static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
         /* Configure the termios structure */
         cp210x_get_termios(tty, port);
 
+        /* The baud rate must be initialised on cp2104 */
+        if (tty)
+                cp210x_change_speed(tty, port, NULL);
+
         return usb_serial_generic_open(tty, port);
 }