USB: ftdi_sio: clean up modem status handling
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index a6e5a0d..58698a6 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2341,6 +2341,7 @@
struct usb_serial_port *port = tty->driver_data;
struct ftdi_private *priv = usb_get_serial_port_data(port);
unsigned char *buf;
+ int len;
int ret;
dbg("%s TIOCMGET", __func__);
@@ -2348,18 +2349,13 @@
buf = kmalloc(2, GFP_KERNEL);
if (!buf)
return -ENOMEM;
-
+ /*
+ * The 8U232AM returns a two byte value (the SIO a 1 byte value) in
+ * the same format as the data returned from the in point.
+ */
switch (priv->chip_type) {
case SIO:
- /* Request the status from the device */
- ret = usb_control_msg(port->serial->dev,
- usb_rcvctrlpipe(port->serial->dev, 0),
- FTDI_SIO_GET_MODEM_STATUS_REQUEST,
- FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
- 0, 0,
- buf, 1, WDR_TIMEOUT);
- if (ret < 0)
- goto out;
+ len = 1;
break;
case FT8U232AM:
case FT232BM:
@@ -2367,23 +2363,22 @@
case FT232RL:
case FT2232H:
case FT4232H:
- /* the 8U232AM returns a two byte value (the sio is a 1 byte
- value) - in the same format as the data returned from the in
- point */
- ret = usb_control_msg(port->serial->dev,
- usb_rcvctrlpipe(port->serial->dev, 0),
- FTDI_SIO_GET_MODEM_STATUS_REQUEST,
- FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
- 0, priv->interface,
- buf, 2, WDR_TIMEOUT);
- if (ret < 0)
- goto out;
+ len = 2;
break;
default:
ret = -EFAULT;
goto out;
}
+ ret = usb_control_msg(port->serial->dev,
+ usb_rcvctrlpipe(port->serial->dev, 0),
+ FTDI_SIO_GET_MODEM_STATUS_REQUEST,
+ FTDI_SIO_GET_MODEM_STATUS_REQUEST_TYPE,
+ 0, priv->interface,
+ buf, len, WDR_TIMEOUT);
+ if (ret < 0)
+ goto out;
+
ret = (buf[0] & FTDI_SIO_DSR_MASK ? TIOCM_DSR : 0) |
(buf[0] & FTDI_SIO_CTS_MASK ? TIOCM_CTS : 0) |
(buf[0] & FTDI_SIO_RI_MASK ? TIOCM_RI : 0) |
