1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 9afb3614373..7d42f61bd7a 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1205,7 +1205,10 @@ static int change_speed(struct tty_struct *tty, struct usb_serial_port *port)
         urb_index_value = get_ftdi_divisor(tty, port);
         urb_value = (__u16)urb_index_value;
         urb_index = (__u16)(urb_index_value >> 16);
-        if (priv->interface) {  /* FT2232C */
+        if ((priv->chip_type == FT2232C) || (priv->chip_type == FT2232H) ||
+                (priv->chip_type == FT4232H) || (priv->chip_type == FT232H)) {
+                /* Probably the BM type needs the MSB of the encoded fractional
+                 * divider also moved like for the chips above. Any infos? */
                 urb_index = (__u16)((urb_index << 8) | priv->interface);
         }