V4L/DVB (4465): Attach the dib3000mc correctly

Flynn Marquardt found out that there is problem with the new dib3000mc-driver
when using with the real dib3000mc. It resulted in a segfault.
Fixed two things: use the correct I2C address and do not attach a tuner, when
the demod was previously failing.
Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/dvb/dvb-usb/dibusb-common.c

@@ -230,15 +230,19 @@ static struct dib3000mc_config mod3000p_dib3000p_config = {
 
 int dibusb_dib3000mc_frontend_attach(struct dvb_usb_device *d)
 {
-	if (dib3000mc_attach(&d->i2c_adap, 1, DEFAULT_DIB3000P_I2C_ADDRESS, 0, &mod3000p_dib3000p_config, &d->fe) == 0) {
-		if (d->priv != NULL) {
-			struct dibusb_state *st = d->priv;
-			st->ops.pid_parse = dib3000mc_pid_parse;
-			st->ops.pid_ctrl  = dib3000mc_pid_control;
-		}
-		return 0;
+	int ret;
+	if ((ret = dib3000mc_attach(&d->i2c_adap, 1, DEFAULT_DIB3000P_I2C_ADDRESS, 0, &mod3000p_dib3000p_config, &d->fe)) != 0)
+		return ret;
+
+	if ((ret = dib3000mc_attach(&d->i2c_adap, 1, DEFAULT_DIB3000MC_I2C_ADDRESS, 0, &mod3000p_dib3000p_config, &d->fe)) != 0)
+		return ret;
+
+	if (d->priv != NULL) {
+		struct dibusb_state *st = d->priv;
+		st->ops.pid_parse = dib3000mc_pid_parse;
+		st->ops.pid_ctrl  = dib3000mc_pid_control;
 	}
-	return -ENODEV;
+	return 0;
 }
 EXPORT_SYMBOL(dibusb_dib3000mc_frontend_attach);
 

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

@@ -191,12 +191,13 @@ int dvb_usb_fe_init(struct dvb_usb_device* d)
 			d->fe = NULL;
 			return -ENODEV;
 		}
+
+		/* only attach the tuner if the demod is there */
+		if (d->props.tuner_attach != NULL)
+			d->props.tuner_attach(d);
 	} else
 		err("no frontend was attached by '%s'",d->desc->name);
 
-	if (d->props.tuner_attach != NULL)
-		d->props.tuner_attach(d);
-
 	return 0;
 }