[media] media: Use a macro to interate between all interfaces

Just like we do with entities, use a similar macro for the
interfaces loop.
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/dvb-core/dvbdev.c

@@ -578,9 +578,10 @@ void dvb_create_media_graph(struct dvb_adapter *adap)
 	}
 
 	/* Create indirect interface links for FE->tuner, DVR->demux and CA->ca */
-	list_for_each_entry(intf, &mdev->interfaces, list) {
+	media_device_for_each_intf(intf, mdev) {
 		if (intf->type == MEDIA_INTF_T_DVB_CA && ca)
 			media_create_intf_link(ca, intf, 0);
+
 		if (intf->type == MEDIA_INTF_T_DVB_FE && tuner)
 			media_create_intf_link(tuner, intf, 0);
 

include/media/media-device.h

@@ -113,6 +113,11 @@ struct media_device *media_device_find_devres(struct device *dev);
 #define media_device_for_each_entity(entity, mdev)			\
 	list_for_each_entry(entity, &(mdev)->entities, list)
 
+/* Iterate over all interfaces. */
+#define media_device_for_each_intf(intf, mdev)			\
+	list_for_each_entry(intf, &(mdev)->interfaces, list)
+
+
 #else
 static inline int media_device_register(struct media_device *mdev)
 {