USB: ftdi_sio: fix latency-timeout endianess bug

Also fixes DMA transfer to stack for latency buffer.

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 ec901ed..59b6cbf 100644 (file)
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1181,22 +1181,28 @@ static int read_latency_timer(struct usb_serial_port *port)
 {
        struct ftdi_private *priv = usb_get_serial_port_data(port);
        struct usb_device *udev = port->serial->dev;
-       unsigned short latency = 0;
+       unsigned char *buf;
        int rv = 0;
 
        dbg("%s", __func__);
 
+       buf = kmalloc(1, GFP_KERNEL);
+       if (!buf)
+               return -ENOMEM;
+
        rv = usb_control_msg(udev,
                             usb_rcvctrlpipe(udev, 0),
                             FTDI_SIO_GET_LATENCY_TIMER_REQUEST,
                             FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE,
                             0, priv->interface,
-                            (char *) &latency, 1, WDR_TIMEOUT);
-
+                            buf, 1, WDR_TIMEOUT);
        if (rv < 0)
                dev_err(&port->dev, "Unable to read latency timer: %i\n", rv);
        else
-               priv->latency = latency;
+               priv->latency = buf[0];
+
+       kfree(buf);
+
        return rv;
 }