[media] cx18: Only allocate a struct cx18_dvb for the DVB TS stream

The cx18_stream struct contained a struct cx18_dvb for
every stream object, most of which were for analog capture.
Now we only allocate the cx18_dvb object for the DTV TS stream.

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/cx18/cx18-driver.h

@@ -325,7 +325,10 @@ struct cx18_queue {
 	spinlock_t lock;
 };
 
+struct cx18_stream; /* forward reference */
+
 struct cx18_dvb {
+	struct cx18_stream *stream;
 	struct dmx_frontend hw_frontend;
 	struct dmx_frontend mem_frontend;
 	struct dmxdev dmxdev;
@@ -365,9 +368,10 @@ struct cx18_in_work_order {
 #define CX18_INVALID_TASK_HANDLE 0xffffffff
 
 struct cx18_stream {
-	/* These first four fields are always set, even if the stream
+	/* These first five fields are always set, even if the stream
 	   is not actually created. */
 	struct video_device *video_dev;	/* NULL when stream not created */
+	struct cx18_dvb *dvb;		/* DVB / Digital Transport */
 	struct cx18 *cx; 		/* for ease of use */
 	const char *name;		/* name of the stream */
 	int type;			/* stream type */
@@ -397,9 +401,6 @@ struct cx18_stream {
 	struct cx18_queue q_idle;	/* idle - not in rotation */
 
 	struct work_struct out_work_order;
-
-	/* DVB / Digital Transport */
-	struct cx18_dvb dvb;
 };
 
 struct cx18_open_id {

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

@@ -137,7 +137,7 @@ static int yuan_mpc718_mt352_init(struct dvb_frontend *fe)
 {
 	struct cx18_dvb *dvb = container_of(fe->dvb,
 					    struct cx18_dvb, dvb_adapter);
-	struct cx18_stream *stream = container_of(dvb, struct cx18_stream, dvb);
+	struct cx18_stream *stream = dvb->stream;
 	const struct firmware *fw = NULL;
 	int ret;
 	int i;
@@ -266,22 +266,22 @@ static int cx18_dvb_start_feed(struct dvb_demux_feed *feed)
 	if (!demux->dmx.frontend)
 		return -EINVAL;
 
-	mutex_lock(&stream->dvb.feedlock);
-	if (stream->dvb.feeding++ == 0) {
+	mutex_lock(&stream->dvb->feedlock);
+	if (stream->dvb->feeding++ == 0) {
 		CX18_DEBUG_INFO("Starting Transport DMA\n");
 		mutex_lock(&cx->serialize_lock);
 		set_bit(CX18_F_S_STREAMING, &stream->s_flags);
 		ret = cx18_start_v4l2_encode_stream(stream);
 		if (ret < 0) {
 			CX18_DEBUG_INFO("Failed to start Transport DMA\n");
-			stream->dvb.feeding--;
-			if (stream->dvb.feeding == 0)
+			stream->dvb->feeding--;
+			if (stream->dvb->feeding == 0)
 				clear_bit(CX18_F_S_STREAMING, &stream->s_flags);
 		}
 		mutex_unlock(&cx->serialize_lock);
 	} else
 		ret = 0;
-	mutex_unlock(&stream->dvb.feedlock);
+	mutex_unlock(&stream->dvb->feedlock);
 
 	return ret;
 }
@@ -299,15 +299,15 @@ static int cx18_dvb_stop_feed(struct dvb_demux_feed *feed)
 		CX18_DEBUG_INFO("Stop feed: pid = 0x%x index = %d\n",
 				feed->pid, feed->index);
 
-		mutex_lock(&stream->dvb.feedlock);
-		if (--stream->dvb.feeding == 0) {
+		mutex_lock(&stream->dvb->feedlock);
+		if (--stream->dvb->feeding == 0) {
 			CX18_DEBUG_INFO("Stopping Transport DMA\n");
 			mutex_lock(&cx->serialize_lock);
 			ret = cx18_stop_v4l2_encode_stream(stream, 0);
 			mutex_unlock(&cx->serialize_lock);
 		} else
 			ret = 0;
-		mutex_unlock(&stream->dvb.feedlock);
+		mutex_unlock(&stream->dvb->feedlock);
 	}
 
 	return ret;
@@ -316,7 +316,7 @@ static int cx18_dvb_stop_feed(struct dvb_demux_feed *feed)
 int cx18_dvb_register(struct cx18_stream *stream)
 {
 	struct cx18 *cx = stream->cx;
-	struct cx18_dvb *dvb = &stream->dvb;
+	struct cx18_dvb *dvb = stream->dvb;
 	struct dvb_adapter *dvb_adapter;
 	struct dvb_demux *dvbdemux;
 	struct dmx_demux *dmx;
@@ -325,6 +325,9 @@ int cx18_dvb_register(struct cx18_stream *stream)
 	if (!dvb)
 		return -EINVAL;
 
+	dvb->enabled = 0;
+	dvb->stream = stream;
+
 	ret = dvb_register_adapter(&dvb->dvb_adapter,
 			CX18_DRIVER_NAME,
 			THIS_MODULE, &cx->pci_dev->dev, adapter_nr);
@@ -378,7 +381,7 @@ int cx18_dvb_register(struct cx18_stream *stream)
 
 	CX18_INFO("DVB Frontend registered\n");
 	CX18_INFO("Registered DVB adapter%d for %s (%d x %d.%02d kB)\n",
-		  stream->dvb.dvb_adapter.num, stream->name,
+		  stream->dvb->dvb_adapter.num, stream->name,
 		  stream->buffers, stream->buf_size/1024,
 		  (stream->buf_size * 100 / 1024) % 100);
 
@@ -405,13 +408,16 @@ err_out:
 void cx18_dvb_unregister(struct cx18_stream *stream)
 {
 	struct cx18 *cx = stream->cx;
-	struct cx18_dvb *dvb = &stream->dvb;
+	struct cx18_dvb *dvb = stream->dvb;
 	struct dvb_adapter *dvb_adapter;
 	struct dvb_demux *dvbdemux;
 	struct dmx_demux *dmx;
 
 	CX18_INFO("unregister DVB\n");
 
+	if (dvb == NULL || !dvb->enabled)
+		return;
+
 	dvb_adapter = &dvb->dvb_adapter;
 	dvbdemux = &dvb->demux;
 	dmx = &dvbdemux->dmx;
@@ -432,7 +438,7 @@ void cx18_dvb_unregister(struct cx18_stream *stream)
  */
 static int dvb_register(struct cx18_stream *stream)
 {
-	struct cx18_dvb *dvb = &stream->dvb;
+	struct cx18_dvb *dvb = stream->dvb;
 	struct cx18 *cx = stream->cx;
 	int ret = 0;
 

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

@@ -136,7 +136,7 @@ static void cx18_mdl_send_to_dvb(struct cx18_stream *s, struct cx18_mdl *mdl)
 {
 	struct cx18_buffer *buf;
 
-	if (!s->dvb.enabled || mdl->bytesused == 0)
+	if (s->dvb == NULL || !s->dvb->enabled || mdl->bytesused == 0)
 		return;
 
 	/* We ignore mdl and buf readpos accounting here - it doesn't matter */
@@ -146,7 +146,7 @@ static void cx18_mdl_send_to_dvb(struct cx18_stream *s, struct cx18_mdl *mdl)
 		buf = list_first_entry(&mdl->buf_list, struct cx18_buffer,
 				       list);
 		if (buf->bytesused)
-			dvb_dmx_swfilter(&s->dvb.demux,
+			dvb_dmx_swfilter(&s->dvb->demux,
 					 buf->buf, buf->bytesused);
 		return;
 	}
@@ -154,7 +154,7 @@ static void cx18_mdl_send_to_dvb(struct cx18_stream *s, struct cx18_mdl *mdl)
 	list_for_each_entry(buf, &mdl->buf_list, list) {
 		if (buf->bytesused == 0)
 			break;
-		dvb_dmx_swfilter(&s->dvb.demux, buf->buf, buf->bytesused);
+		dvb_dmx_swfilter(&s->dvb->demux, buf->buf, buf->bytesused);
 	}
 }
 

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

@@ -107,6 +107,7 @@ static void cx18_stream_init(struct cx18 *cx, int type)
 	s->video_dev = video_dev;
 
 	/* initialize cx18_stream fields */
+	s->dvb = NULL;
 	s->cx = cx;
 	s->type = type;
 	s->name = cx18_stream_info[type].name;
@@ -140,10 +141,15 @@ static int cx18_prep_dev(struct cx18 *cx, int type)
 	int num_offset = cx18_stream_info[type].num_offset;
 	int num = cx->instance + cx18_first_minor + num_offset;
 
-	/* These four fields are always initialized. If video_dev == NULL, then
-	   this stream is not in use. In that case no other fields but these
-	   four can be used. */
+	/*
+	 * These five fields are always initialized.
+	 * For analog capture related streams, if video_dev == NULL then the
+	 * stream is not in use.
+	 * For the TS stream, if dvb == NULL then the stream is not in use.
+	 * In those cases no other fields but these four can be used.
+	 */
 	s->video_dev = NULL;
+	s->dvb = NULL;
 	s->cx = cx;
 	s->type = type;
 	s->name = cx18_stream_info[type].name;
@@ -167,6 +173,21 @@ static int cx18_prep_dev(struct cx18 *cx, int type)
 
 	cx18_stream_init(cx, type);
 
+	/* Allocate the cx18_dvb struct only for the TS on cards with DTV */
+	if (type == CX18_ENC_STREAM_TYPE_TS) {
+		if (cx->card->hw_all & CX18_HW_DVB) {
+			s->dvb = kzalloc(sizeof(struct cx18_dvb), GFP_KERNEL);
+			if (s->dvb == NULL) {
+				CX18_ERR("Couldn't allocate cx18_dvb structure"
+					 " for %s\n", s->name);
+				return -ENOMEM;
+			}
+		} else {
+			/* Don't need buffers for the TS, if there is no DVB */
+			s->buffers = 0;
+		}
+	}
+
 	if (num_offset == -1)
 		return 0;
 
@@ -222,13 +243,7 @@ static int cx18_reg_dev(struct cx18 *cx, int type)
 	const char *name;
 	int num, ret;
 
-	/* TODO: Shouldn't this be a VFL_TYPE_TRANSPORT or something?
-	 * We need a VFL_TYPE_TS defined.
-	 */
-	if (strcmp("TS", s->name) == 0) {
-		/* just return if no DVB is supported */
-		if ((cx->card->hw_all & CX18_HW_DVB) == 0)
-			return 0;
+	if (type == CX18_ENC_STREAM_TYPE_TS && s->dvb != NULL) {
 		ret = cx18_dvb_register(s);
 		if (ret < 0) {
 			CX18_ERR("DVB failed to register\n");
@@ -320,11 +335,13 @@ 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 */
+		/* The TS has a cx18_dvb structure, not a video_device */
 		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;
+			if (cx->streams[type].dvb != NULL) {
+				if (unregister)
+					cx18_dvb_unregister(&cx->streams[type]);
+				kfree(cx->streams[type].dvb);
+				cx->streams[type].dvb = NULL;
 				cx18_stream_free(&cx->streams[type]);
 			}
 			continue;

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

@@ -33,7 +33,8 @@ void cx18_stream_rotate_idx_mdls(struct cx18 *cx);
 
 static inline bool cx18_stream_enabled(struct cx18_stream *s)
 {
-	return s->video_dev || s->dvb.enabled ||
+	return s->video_dev ||
+	       (s->dvb && s->dvb->enabled) ||
 	       (s->type == CX18_ENC_STREAM_TYPE_IDX &&
 		s->cx->stream_buffers[CX18_ENC_STREAM_TYPE_IDX] != 0);
 }