V4L/DVB (9114): dib0700: fix bad assignment of dib0700_xc5000_tuner_callback after return call

Put callback definition before function return and cleanup callback:

Fix a bug where the xc5000 callback was being set *after* the
return call (essentially resulting in dead code).

Also cleanup the callback function to detect unknown commands.
Signed-off-by: Devin Heitmueller <devin.heitmueller@gmail.com>
Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/dvb-usb/dib0700_devices.c

@@ -1181,11 +1181,16 @@ static int dib0700_xc5000_tuner_callback(void *priv, int component,
 {
 	struct dvb_usb_adapter *adap = priv;
 
-	/* Reset the tuner */
-	dib0700_set_gpio(adap->dev, GPIO1, GPIO_OUT, 0);
-	msleep(330); /* from Windows USB trace */
-	dib0700_set_gpio(adap->dev, GPIO1, GPIO_OUT, 1);
-	msleep(330); /* from Windows USB trace */
+	if (command == XC5000_TUNER_RESET) {
+		/* Reset the tuner */
+		dib0700_set_gpio(adap->dev, GPIO1, GPIO_OUT, 0);
+		msleep(330); /* from Windows USB trace */
+		dib0700_set_gpio(adap->dev, GPIO1, GPIO_OUT, 1);
+		msleep(330); /* from Windows USB trace */
+	} else {
+		err("xc5000: unknown tuner callback command: %d\n", command);
+		return -EINVAL;
+	}
 
 	return 0;
 }
@@ -1197,12 +1202,12 @@ static struct xc5000_config s5h1411_xc5000_tunerconfig = {
 
 static int xc5000_tuner_attach(struct dvb_usb_adapter *adap)
 {
+	/* FIXME: generalize & move to common area */
+	adap->fe->callback = dib0700_xc5000_tuner_callback;
+
 	return dvb_attach(xc5000_attach, adap->fe, &adap->dev->i2c_adap,
 			  &s5h1411_xc5000_tunerconfig)
 		== NULL ? -ENODEV : 0;
-
-	/* FIXME: generalize & move to common area */
-	adap->fe->callback = dib0700_xc5000_tuner_callback;
 }
 
 /* DVB-USB and USB stuff follows */