[media] ngene: Clean-up driver initialisation (part 1)

If tuner initialisation failed, the frontend node was not removed.
When the frontend was opened, a kernel oops occurred...

This is the first step to improve error handling during initialisation.
Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/ngene/ngene-cards.c

@@ -113,6 +113,7 @@ static int demod_attach_stv0900(struct ngene_channel *chan)
 			0, chan->dev->card_info->lnb[chan->number])) {
 		printk(KERN_ERR DEVICE_NAME ": No LNBH24 found!\n");
 		dvb_frontend_detach(chan->fe);
+		chan->fe = NULL;
 		return -ENODEV;
 	}
 

drivers/media/dvb/ngene/ngene-core.c

@@ -1482,23 +1482,32 @@ static int init_channel(struct ngene_channel *chan)
 
 	if (io & NGENE_IO_TSIN) {
 		chan->fe = NULL;
-		if (ni->demod_attach[nr])
-			ni->demod_attach[nr](chan);
+		if (ni->demod_attach[nr]) {
+			ret = ni->demod_attach[nr](chan);
+			if (ret < 0)
+				goto err_fe;
+		}
+		if (chan->fe && ni->tuner_attach[nr]) {
+			ret = ni->tuner_attach[nr](chan);
+			if (ret < 0)
+				goto err_fe;
+		}
 		if (chan->fe) {
-			if (dvb_register_frontend(adapter, chan->fe) < 0) {
-				if (chan->fe->ops.release)
-					chan->fe->ops.release(chan->fe);
-				chan->fe = NULL;
-			}
+			if (dvb_register_frontend(adapter, chan->fe) < 0)
+				goto err_fe;
 		}
-		if (chan->fe && ni->tuner_attach[nr])
-			if (ni->tuner_attach[nr] (chan) < 0) {
-				printk(KERN_ERR DEVICE_NAME
-				       ": Tuner attach failed on channel %d!\n",
-				       nr);
-			}
 	}
 	return ret;
+
+err_fe:
+	if (chan->fe) {
+		dvb_frontend_detach(chan->fe);
+		chan->fe = NULL;
+	}
+/*	FIXME: this causes an oops... */
+/*	release_channel(chan);        */
+/*	return ret;                   */
+	return 0;
 }
 
 static int init_channels(struct ngene *dev)