1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index 885655315de1..edbc81f205c2 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -322,8 +322,12 @@ static int mct_u232_get_modem_stat(struct usb_serial_port *port,
                         MCT_U232_GET_REQUEST_TYPE,
                         0, 0, buf, MCT_U232_GET_MODEM_STAT_SIZE,
                         WDR_TIMEOUT);
-        if (rc < 0) {
+        if (rc < MCT_U232_GET_MODEM_STAT_SIZE) {
                 dev_err(&port->dev, "Get MODEM STATus failed (error = %d)\n", rc);
+
+                if (rc >= 0)
+                        rc = -EIO;
+
                 *msr = 0;
         } else {
                 *msr = buf[0];