V4L/DVB (13904): cx18: Fix TS and IDX stream buffer memory leak on module unload

Fix a long standing memory leak of stream buffers for streams that did not
have a struct video_device allocated: namely the TS and IDX streams.
Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx18/cx18-queue.c

@@ -419,6 +419,9 @@ void cx18_stream_free(struct cx18_stream *s)
 {
 	struct cx18_mdl *mdl;
 	struct cx18_buffer *buf;
+	struct cx18 *cx = s->cx;
+
+	CX18_DEBUG_INFO("Deallocating buffers for %s stream\n", s->name);
 
 	/* move all buffers to buf_pool and all MDLs to q_idle */
 	cx18_unload_queues(s);

drivers/media/video/cx18/cx18-streams.c

@@ -319,11 +319,27 @@ void cx18_streams_cleanup(struct cx18 *cx, int unregister)
 
 	/* Teardown all streams */
 	for (type = 0; type < CX18_MAX_STREAMS; type++) {
+
+		/* No struct video_device, but can have buffers allocated */
+		if (type == CX18_ENC_STREAM_TYPE_TS) {
 			if (cx->streams[type].dvb.enabled) {
 				cx18_dvb_unregister(&cx->streams[type]);
 				cx->streams[type].dvb.enabled = false;
+				cx18_stream_free(&cx->streams[type]);
+			}
+			continue;
+		}
+
+		/* No struct video_device, but can have buffers allocated */
+		if (type == CX18_ENC_STREAM_TYPE_IDX) {
+			if (cx->stream_buffers[type] != 0) {
+				cx->stream_buffers[type] = 0;
+				cx18_stream_free(&cx->streams[type]);
+			}
+			continue;
 		}
 
+		/* If struct video_device exists, can have buffers allocated */
 		vdev = cx->streams[type].video_dev;
 
 		cx->streams[type].video_dev = NULL;