USB: mct_u232: Fix incorrect TIOCMSET return

commit 1aa3c63cf0a79153ee13c8f82e4eb6c40b66a161 upstream.

The low level helper returns 1 on success. The ioctl should however return
0. As this is the only user of the helper return, make the helper return 0 or
an error code.

Resolves-bug: https://bugzilla.kernel.org/show_bug.cgi?id=43009
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index ba0d287..42de17b 100644 (file)
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -359,13 +359,16 @@ static int mct_u232_set_modem_ctrl(struct usb_serial *serial,
                        MCT_U232_SET_REQUEST_TYPE,
                        0, 0, buf, MCT_U232_SET_MODEM_CTRL_SIZE,
                        WDR_TIMEOUT);
-       if (rc < 0)
-               dev_err(&serial->dev->dev,
-                       "Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc);
+       kfree(buf);
+
        dbg("set_modem_ctrl: state=0x%x ==> mcr=0x%x", control_state, mcr);
 
-       kfree(buf);
-       return rc;
+       if (rc < 0) {
+               dev_err(&serial->dev->dev,
+                       "Set MODEM CTRL 0x%x failed (error = %d)\n", mcr, rc);
+               return rc;
+       }
+       return 0;
 } /* mct_u232_set_modem_ctrl */
 
 static int mct_u232_get_modem_stat(struct usb_serial *serial,