1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 99a0a5f1b400..d8d13eede6d9 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1439,10 +1439,13 @@ static int read_latency_timer(struct usb_serial_port *port)
                              FTDI_SIO_GET_LATENCY_TIMER_REQUEST_TYPE,
                              0, priv->interface,
                              buf, 1, WDR_TIMEOUT);
-        if (rv < 0)
+        if (rv < 1) {
                 dev_err(&port->dev, "Unable to read latency timer: %i\n", rv);
-        else
+                if (rv >= 0)
+                        rv = -EIO;
+        } else {
                 priv->latency = buf[0];
+        }
 
         kfree(buf);