Merge remote-tracking branch 'asoc/topic/dapm' into asoc-next

6 files changed, 311 insertions, 347 deletions

diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
index 37d95a898275..5abba037d245 100644
--- a/include/sound/soc-dapm.h
+++ b/include/sound/soc-dapm.h
@@ -397,6 +397,7 @@ int snd_soc_dapm_del_routes(struct snd_soc_dapm_context *dapm,
 			    const struct snd_soc_dapm_route *route, int num);
 int snd_soc_dapm_weak_routes(struct snd_soc_dapm_context *dapm,
 			     const struct snd_soc_dapm_route *route, int num);
+void snd_soc_dapm_free_widget(struct snd_soc_dapm_widget *w);
 
 /* dapm events */
 void snd_soc_dapm_stream_event(struct snd_soc_pcm_runtime *rtd, int stream,
@@ -511,9 +512,18 @@ struct snd_soc_dapm_route {
 struct snd_soc_dapm_path {
 	const char *name;
 
-	/* source (input) and sink (output) widgets */
-	struct snd_soc_dapm_widget *source;
-	struct snd_soc_dapm_widget *sink;
+	/*
+	 * source (input) and sink (output) widgets
+	 * The union is for convience, since it is a lot nicer to type
+	 * p->source, rather than p->node[SND_SOC_DAPM_DIR_IN]
+	 */
+	union {
+		struct {
+			struct snd_soc_dapm_widget *source;
+			struct snd_soc_dapm_widget *sink;
+		};
+		struct snd_soc_dapm_widget *node[2];
+	};
 
 	/* status */
 	u32 connect:1;	/* source and sink widgets are connected */
@@ -524,8 +534,7 @@ struct snd_soc_dapm_path {
 	int (*connected)(struct snd_soc_dapm_widget *source,
 			 struct snd_soc_dapm_widget *sink);
 
-	struct list_head list_source;
-	struct list_head list_sink;
+	struct list_head list_node[2];
 	struct list_head list_kcontrol;
 	struct list_head list;
 };
@@ -559,8 +568,7 @@ struct snd_soc_dapm_widget {
 	unsigned char new_power:1;		/* power from this run */
 	unsigned char power_checked:1;		/* power checked this run */
 	unsigned char is_supply:1;		/* Widget is a supply type widget */
-	unsigned char is_sink:1;		/* Widget is a sink type widget */
-	unsigned char is_source:1;		/* Widget is a source type widget */
+	unsigned char is_ep:2;			/* Widget is a endpoint type widget */
 	int subseq;				/* sort within widget type */
 
 	int (*power_check)(struct snd_soc_dapm_widget *w);
@@ -575,16 +583,14 @@ struct snd_soc_dapm_widget {
 	struct snd_kcontrol **kcontrols;
 	struct snd_soc_dobj dobj;
 
-	/* widget input and outputs */
-	struct list_head sources;
-	struct list_head sinks;
+	/* widget input and output edges */
+	struct list_head edges[2];
 
 	/* used during DAPM updates */
 	struct list_head work_list;
 	struct list_head power_list;
 	struct list_head dirty;
-	int inputs;
-	int outputs;
+	int endpoints[2];
 
 	struct clk *clk;
 };
@@ -672,4 +678,58 @@ static inline enum snd_soc_bias_level snd_soc_dapm_get_bias_level(
 	return dapm->bias_level;
 }
 
+enum snd_soc_dapm_direction {
+	SND_SOC_DAPM_DIR_IN,
+	SND_SOC_DAPM_DIR_OUT
+};
+
+#define SND_SOC_DAPM_DIR_TO_EP(x) BIT(x)
+
+#define SND_SOC_DAPM_EP_SOURCE SND_SOC_DAPM_DIR_TO_EP(SND_SOC_DAPM_DIR_IN)
+#define SND_SOC_DAPM_EP_SINK SND_SOC_DAPM_DIR_TO_EP(SND_SOC_DAPM_DIR_OUT)
+
+/**
+ * snd_soc_dapm_widget_for_each_sink_path - Iterates over all paths in the
+ *   specified direction of a widget
+ * @w: The widget
+ * @dir: Whether to iterate over the paths where the specified widget is the
+ *       incoming or outgoing widgets
+ * @p: The path iterator variable
+ */
+#define snd_soc_dapm_widget_for_each_path(w, dir, p) \
+	list_for_each_entry(p, &w->edges[dir], list_node[dir])
+
+/**
+ * snd_soc_dapm_widget_for_each_sink_path_safe - Iterates over all paths in the
+ *   specified direction of a widget
+ * @w: The widget
+ * @dir: Whether to iterate over the paths where the specified widget is the
+ *       incoming or outgoing widgets
+ * @p: The path iterator variable
+ * @next_p: Temporary storage for the next path
+ *
+ *  This function works like snd_soc_dapm_widget_for_each_sink_path, expect that
+ *  it is safe to remove the current path from the list while iterating
+ */
+#define snd_soc_dapm_widget_for_each_path_safe(w, dir, p, next_p) \
+	list_for_each_entry_safe(p, next_p, &w->edges[dir], list_node[dir])
+
+/**
+ * snd_soc_dapm_widget_for_each_sink_path - Iterates over all paths leaving a
+ *  widget
+ * @w: The widget
+ * @p: The path iterator variable
+ */
+#define snd_soc_dapm_widget_for_each_sink_path(w, p) \
+	snd_soc_dapm_widget_for_each_path(w, SND_SOC_DAPM_DIR_IN, p)
+
+/**
+ * snd_soc_dapm_widget_for_each_source_path - Iterates over all paths leading to
+ *  a widget
+ * @w: The widget
+ * @p: The path iterator variable
+ */
+#define snd_soc_dapm_widget_for_each_source_path(w, p) \
+	snd_soc_dapm_widget_for_each_path(w, SND_SOC_DAPM_DIR_OUT, p)
+
 #endif
diff --git a/include/trace/events/asoc.h b/include/trace/events/asoc.h
index 88cf39d96d0f..317a1ed2f4ac 100644
--- a/include/trace/events/asoc.h
+++ b/include/trace/events/asoc.h
@@ -8,6 +8,7 @@
 #include <linux/tracepoint.h>
 
 #define DAPM_DIRECT "(direct)"
+#define DAPM_ARROW(dir) (((dir) == SND_SOC_DAPM_DIR_OUT) ? "->" : "<-")
 
 struct snd_soc_jack;
 struct snd_soc_codec;
@@ -152,62 +153,38 @@ TRACE_EVENT(snd_soc_dapm_walk_done,
 		  (int)__entry->path_checks, (int)__entry->neighbour_checks)
 );
 
-TRACE_EVENT(snd_soc_dapm_output_path,
+TRACE_EVENT(snd_soc_dapm_path,
 
 	TP_PROTO(struct snd_soc_dapm_widget *widget,
+		enum snd_soc_dapm_direction dir,
 		struct snd_soc_dapm_path *path),
 
-	TP_ARGS(widget, path),
+	TP_ARGS(widget, dir, path),
 
 	TP_STRUCT__entry(
 		__string(	wname,	widget->name		)
 		__string(	pname,	path->name ? path->name : DAPM_DIRECT)
-		__string(	psname,	path->sink->name	)
-		__field(	int,	path_sink		)
+		__string(	pnname,	path->node[dir]->name	)
+		__field(	int,	path_node		)
 		__field(	int,	path_connect		)
+		__field(	int,	path_dir		)
 	),
 
 	TP_fast_assign(
 		__assign_str(wname, widget->name);
 		__assign_str(pname, path->name ? path->name : DAPM_DIRECT);
-		__assign_str(psname, path->sink->name);
+		__assign_str(pnname, path->node[dir]->name);
 		__entry->path_connect = path->connect;
-		__entry->path_sink = (long)path->sink;
+		__entry->path_node = (long)path->node[dir];
+		__entry->path_dir = dir;
 	),
 
-	TP_printk("%c%s -> %s -> %s",
-		(int) __entry->path_sink &&
+	TP_printk("%c%s %s %s %s %s",
+		(int) __entry->path_node &&
 		(int) __entry->path_connect ? '*' : ' ',
-		__get_str(wname), __get_str(pname), __get_str(psname))
-);
-
-TRACE_EVENT(snd_soc_dapm_input_path,
-
-	TP_PROTO(struct snd_soc_dapm_widget *widget,
-		struct snd_soc_dapm_path *path),
-
-	TP_ARGS(widget, path),
-
-	TP_STRUCT__entry(
-		__string(	wname,	widget->name		)
-		__string(	pname,	path->name ? path->name : DAPM_DIRECT)
-		__string(	psname,	path->source->name	)
-		__field(	int,	path_source		)
-		__field(	int,	path_connect		)
-	),
-
-	TP_fast_assign(
-		__assign_str(wname, widget->name);
-		__assign_str(pname, path->name ? path->name : DAPM_DIRECT);
-		__assign_str(psname, path->source->name);
-		__entry->path_connect = path->connect;
-		__entry->path_source = (long)path->source;
-	),
-
-	TP_printk("%c%s <- %s <- %s",
-		(int) __entry->path_source &&
-		(int) __entry->path_connect ? '*' : ' ',
-		__get_str(wname), __get_str(pname), __get_str(psname))
+		__get_str(wname), DAPM_ARROW(__entry->path_dir),
+		__get_str(pname), DAPM_ARROW(__entry->path_dir),
+		__get_str(pnname))
 );
 
 TRACE_EVENT(snd_soc_dapm_connected,
diff --git a/sound/soc/intel/atom/sst-atom-controls.c b/sound/soc/intel/atom/sst-atom-controls.c
index 31e9b9ecbb8a..1399e34add72 100644
--- a/sound/soc/intel/atom/sst-atom-controls.c
+++ b/sound/soc/intel/atom/sst-atom-controls.c
@@ -1298,7 +1298,7 @@ int sst_send_pipe_gains(struct snd_soc_dai *dai, int stream, int mute)
 		dev_dbg(dai->dev, "Stream name=%s\n",
 				dai->playback_widget->name);
 		w = dai->playback_widget;
-		list_for_each_entry(p, &w->sinks, list_source) {
+		snd_soc_dapm_widget_for_each_sink_path(w, p) {
 			if (p->connected && !p->connected(w, p->sink))
 				continue;
 
@@ -1317,7 +1317,7 @@ int sst_send_pipe_gains(struct snd_soc_dai *dai, int stream, int mute)
 		dev_dbg(dai->dev, "Stream name=%s\n",
 				dai->capture_widget->name);
 		w = dai->capture_widget;
-		list_for_each_entry(p, &w->sources, list_sink) {
+		snd_soc_dapm_widget_for_each_source_path(w, p) {
 			if (p->connected && !p->connected(w, p->sink))
 				continue;
 
diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index e556e6b6efd1..c0117dd5c770 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -47,6 +47,13 @@
 
 #define DAPM_UPDATE_STAT(widget, val) widget->dapm->card->dapm_stats.val++;
 
+#define SND_SOC_DAPM_DIR_REVERSE(x) ((x == SND_SOC_DAPM_DIR_IN) ? \
+	SND_SOC_DAPM_DIR_OUT : SND_SOC_DAPM_DIR_IN)
+
+#define snd_soc_dapm_for_each_direction(dir) \
+	for ((dir) = SND_SOC_DAPM_DIR_IN; (dir) <= SND_SOC_DAPM_DIR_OUT; \
+		(dir)++)
+
 static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
 	struct snd_soc_dapm_widget *wsource, struct snd_soc_dapm_widget *wsink,
 	const char *control,
@@ -167,45 +174,59 @@ static void dapm_mark_dirty(struct snd_soc_dapm_widget *w, const char *reason)
 }
 
 /*
- * dapm_widget_invalidate_input_paths() - Invalidate the cached number of input
- *  paths
- * @w: The widget for which to invalidate the cached number of input paths
- *
- * The function resets the cached number of inputs for the specified widget and
- * all widgets that can be reached via outgoing paths from the widget.
- *
- * This function must be called if the number of input paths for a widget might
- * have changed. E.g. if the source state of a widget changes or a path is added
- * or activated with the widget as the sink.
+ * Common implementation for dapm_widget_invalidate_input_paths() and
+ * dapm_widget_invalidate_output_paths(). The function is inlined since the
+ * combined size of the two specialized functions is only marginally larger then
+ * the size of the generic function and at the same time the fast path of the
+ * specialized functions is significantly smaller than the generic function.
  */
-static void dapm_widget_invalidate_input_paths(struct snd_soc_dapm_widget *w)
+static __always_inline void dapm_widget_invalidate_paths(
+	struct snd_soc_dapm_widget *w, enum snd_soc_dapm_direction dir)
 {
-	struct snd_soc_dapm_widget *sink;
+	enum snd_soc_dapm_direction rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
+	struct snd_soc_dapm_widget *node;
 	struct snd_soc_dapm_path *p;
 	LIST_HEAD(list);
 
 	dapm_assert_locked(w->dapm);
 
-	if (w->inputs == -1)
+	if (w->endpoints[dir] == -1)
 		return;
 
-	w->inputs = -1;
 	list_add_tail(&w->work_list, &list);
+	w->endpoints[dir] = -1;
 
 	list_for_each_entry(w, &list, work_list) {
-		list_for_each_entry(p, &w->sinks, list_source) {
+		snd_soc_dapm_widget_for_each_path(w, dir, p) {
 			if (p->is_supply || p->weak || !p->connect)
 				continue;
-			sink = p->sink;
-			if (sink->inputs != -1) {
-				sink->inputs = -1;
-				list_add_tail(&sink->work_list, &list);
+			node = p->node[rdir];
+			if (node->endpoints[dir] != -1) {
+				node->endpoints[dir] = -1;
+				list_add_tail(&node->work_list, &list);
 			}
 		}
 	}
 }
 
 /*
+ * dapm_widget_invalidate_input_paths() - Invalidate the cached number of
+ *  input paths
+ * @w: The widget for which to invalidate the cached number of input paths
+ *
+ * Resets the cached number of inputs for the specified widget and all widgets
+ * that can be reached via outcoming paths from the widget.
+ *
+ * This function must be called if the number of output paths for a widget might
+ * have changed. E.g. if the source state of a widget changes or a path is added
+ * or activated with the widget as the sink.
+ */
+static void dapm_widget_invalidate_input_paths(struct snd_soc_dapm_widget *w)
+{
+	dapm_widget_invalidate_paths(w, SND_SOC_DAPM_DIR_IN);
+}
+
+/*
  * dapm_widget_invalidate_output_paths() - Invalidate the cached number of
  *  output paths
  * @w: The widget for which to invalidate the cached number of output paths
@@ -219,29 +240,7 @@ static void dapm_widget_invalidate_input_paths(struct snd_soc_dapm_widget *w)
  */
 static void dapm_widget_invalidate_output_paths(struct snd_soc_dapm_widget *w)
 {
-	struct snd_soc_dapm_widget *source;
-	struct snd_soc_dapm_path *p;
-	LIST_HEAD(list);
-
-	dapm_assert_locked(w->dapm);
-
-	if (w->outputs == -1)
-		return;
-
-	w->outputs = -1;
-	list_add_tail(&w->work_list, &list);
-
-	list_for_each_entry(w, &list, work_list) {
-		list_for_each_entry(p, &w->sources, list_sink) {
-			if (p->is_supply || p->weak || !p->connect)
-				continue;
-			source = p->source;
-			if (source->outputs != -1) {
-				source->outputs = -1;
-				list_add_tail(&source->work_list, &list);
-			}
-		}
-	}
+	dapm_widget_invalidate_paths(w, SND_SOC_DAPM_DIR_OUT);
 }
 
 /*
@@ -270,9 +269,9 @@ static void dapm_path_invalidate(struct snd_soc_dapm_path *p)
 	 * endpoints is either connected or disconnected that sum won't change,
 	 * so there is no need to re-check the path.
 	 */
-	if (p->source->inputs != 0)
+	if (p->source->endpoints[SND_SOC_DAPM_DIR_IN] != 0)
 		dapm_widget_invalidate_input_paths(p->sink);
-	if (p->sink->outputs != 0)
+	if (p->sink->endpoints[SND_SOC_DAPM_DIR_OUT] != 0)
 		dapm_widget_invalidate_output_paths(p->source);
 }
 
@@ -283,11 +282,11 @@ void dapm_mark_endpoints_dirty(struct snd_soc_card *card)
 	mutex_lock(&card->dapm_mutex);
 
 	list_for_each_entry(w, &card->widgets, list) {
-		if (w->is_sink || w->is_source) {
+		if (w->is_ep) {
 			dapm_mark_dirty(w, "Rechecking endpoints");
-			if (w->is_sink)
+			if (w->is_ep & SND_SOC_DAPM_EP_SINK)
 				dapm_widget_invalidate_output_paths(w);
-			if (w->is_source)
+			if (w->is_ep & SND_SOC_DAPM_EP_SOURCE)
 				dapm_widget_invalidate_input_paths(w);
 		}
 	}
@@ -894,7 +893,7 @@ static int dapm_new_mixer(struct snd_soc_dapm_widget *w)
 	/* add kcontrol */
 	for (i = 0; i < w->num_kcontrols; i++) {
 		/* match name */
-		list_for_each_entry(path, &w->sources, list_sink) {
+		snd_soc_dapm_widget_for_each_source_path(w, path) {
 			/* mixer/mux paths name must match control name */
 			if (path->name != (char *)w->kcontrol_news[i].name)
 				continue;
@@ -923,18 +922,18 @@ static int dapm_new_mixer(struct snd_soc_dapm_widget *w)
 static int dapm_new_mux(struct snd_soc_dapm_widget *w)
 {
 	struct snd_soc_dapm_context *dapm = w->dapm;
+	enum snd_soc_dapm_direction dir;
 	struct snd_soc_dapm_path *path;
-	struct list_head *paths;
 	const char *type;
 	int ret;
 
 	switch (w->id) {
 	case snd_soc_dapm_mux:
-		paths = &w->sources;
+		dir = SND_SOC_DAPM_DIR_OUT;
 		type = "mux";
 		break;
 	case snd_soc_dapm_demux:
-		paths = &w->sinks;
+		dir = SND_SOC_DAPM_DIR_IN;
 		type = "demux";
 		break;
 	default:
@@ -948,7 +947,7 @@ static int dapm_new_mux(struct snd_soc_dapm_widget *w)
 		return -EINVAL;
 	}
 
-	if (list_empty(paths)) {
+	if (list_empty(&w->edges[dir])) {
 		dev_err(dapm->dev, "ASoC: %s %s has no paths\n", type, w->name);
 		return -EINVAL;
 	}
@@ -957,16 +956,9 @@ static int dapm_new_mux(struct snd_soc_dapm_widget *w)
 	if (ret < 0)
 		return ret;
 
-	if (w->id == snd_soc_dapm_mux) {
-		list_for_each_entry(path, &w->sources, list_sink) {
-			if (path->name)
-				dapm_kcontrol_add_path(w->kcontrols[0], path);
-		}
-	} else {
-		list_for_each_entry(path, &w->sinks, list_source) {
-			if (path->name)
-				dapm_kcontrol_add_path(w->kcontrols[0], path);
-		}
+	snd_soc_dapm_widget_for_each_path(w, dir, path) {
+		if (path->name)
+			dapm_kcontrol_add_path(w->kcontrols[0], path);
 	}
 
 	return 0;
@@ -1032,66 +1024,59 @@ static int snd_soc_dapm_suspend_check(struct snd_soc_dapm_widget *widget)
 	}
 }
 
-/* add widget to list if it's not already in the list */
-static int dapm_list_add_widget(struct snd_soc_dapm_widget_list **list,
-	struct snd_soc_dapm_widget *w)
+static int dapm_widget_list_create(struct snd_soc_dapm_widget_list **list,
+	struct list_head *widgets)
 {
-	struct snd_soc_dapm_widget_list *wlist;
-	int wlistsize, wlistentries, i;
-
-	if (*list == NULL)
-		return -EINVAL;
-
-	wlist = *list;
+	struct snd_soc_dapm_widget *w;
+	struct list_head *it;
+	unsigned int size = 0;
+	unsigned int i = 0;
 
-	/* is this widget already in the list */
-	for (i = 0; i < wlist->num_widgets; i++) {
-		if (wlist->widgets[i] == w)
-			return 0;
-	}
+	list_for_each(it, widgets)
+		size++;
 
-	/* allocate some new space */
-	wlistentries = wlist->num_widgets + 1;
-	wlistsize = sizeof(struct snd_soc_dapm_widget_list) +
-			wlistentries * sizeof(struct snd_soc_dapm_widget *);
-	*list = krealloc(wlist, wlistsize, GFP_KERNEL);
-	if (*list == NULL) {
-		dev_err(w->dapm->dev, "ASoC: can't allocate widget list for %s\n",
-			w->name);
+	*list = kzalloc(sizeof(**list) + size * sizeof(*w), GFP_KERNEL);
+	if (*list == NULL)
 		return -ENOMEM;
-	}
-	wlist = *list;
 
-	/* insert the widget */
-	dev_dbg(w->dapm->dev, "ASoC: added %s in widget list pos %d\n",
-			w->name, wlist->num_widgets);
+	list_for_each_entry(w, widgets, work_list)
+		(*list)->widgets[i++] = w;
 
-	wlist->widgets[wlist->num_widgets] = w;
-	wlist->num_widgets++;
-	return 1;
+	(*list)->num_widgets = i;
+
+	return 0;
 }
 
 /*
- * Recursively check for a completed path to an active or physically connected
- * output widget. Returns number of complete paths.
+ * Common implementation for is_connected_output_ep() and
+ * is_connected_input_ep(). The function is inlined since the combined size of
+ * the two specialized functions is only marginally larger then the size of the
+ * generic function and at the same time the fast path of the specialized
+ * functions is significantly smaller than the generic function.
  */
-static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
-	struct snd_soc_dapm_widget_list **list)
+static __always_inline int is_connected_ep(struct snd_soc_dapm_widget *widget,
+	struct list_head *list, enum snd_soc_dapm_direction dir,
+	int (*fn)(struct snd_soc_dapm_widget *, struct list_head *))
 {
+	enum snd_soc_dapm_direction rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
 	struct snd_soc_dapm_path *path;
 	int con = 0;
 
-	if (widget->outputs >= 0)
-		return widget->outputs;
+	if (widget->endpoints[dir] >= 0)
+		return widget->endpoints[dir];
 
 	DAPM_UPDATE_STAT(widget, path_checks);
 
-	if (widget->is_sink && widget->connected) {
-		widget->outputs = snd_soc_dapm_suspend_check(widget);
-		return widget->outputs;
+	/* do we need to add this widget to the list ? */
+	if (list)
+		list_add_tail(&widget->work_list, list);
+
+	if ((widget->is_ep & SND_SOC_DAPM_DIR_TO_EP(dir)) && widget->connected) {
+		widget->endpoints[dir] = snd_soc_dapm_suspend_check(widget);
+		return widget->endpoints[dir];
 	}
 
-	list_for_each_entry(path, &widget->sinks, list_source) {
+	snd_soc_dapm_widget_for_each_path(widget, rdir, path) {
 		DAPM_UPDATE_STAT(widget, neighbour_checks);
 
 		if (path->weak || path->is_supply)
@@ -1100,91 +1085,40 @@ static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
 		if (path->walking)
 			return 1;
 
-		trace_snd_soc_dapm_output_path(widget, path);
+		trace_snd_soc_dapm_path(widget, dir, path);
 
 		if (path->connect) {
 			path->walking = 1;
-
-			/* do we need to add this widget to the list ? */
-			if (list) {
-				int err;
-				err = dapm_list_add_widget(list, path->sink);
-				if (err < 0) {
-					dev_err(widget->dapm->dev,
-						"ASoC: could not add widget %s\n",
-						widget->name);
-					path->walking = 0;
-					return con;
-				}
-			}
-
-			con += is_connected_output_ep(path->sink, list);
-
+			con += fn(path->node[dir], list);
 			path->walking = 0;
 		}
 	}
 
-	widget->outputs = con;
+	widget->endpoints[dir] = con;
 
 	return con;
 }
 
 /*
  * Recursively check for a completed path to an active or physically connected
+ * output widget. Returns number of complete paths.
+ */
+static int is_connected_output_ep(struct snd_soc_dapm_widget *widget,
+	struct list_head *list)
+{
+	return is_connected_ep(widget, list, SND_SOC_DAPM_DIR_OUT,
+			is_connected_output_ep);
+}
+
+/*
+ * Recursively check for a completed path to an active or physically connected
  * input widget. Returns number of complete paths.
  */
 static int is_connected_input_ep(struct snd_soc_dapm_widget *widget,
-	struct snd_soc_dapm_widget_list **list)
+	struct list_head *list)
 {
-	struct snd_soc_dapm_path *path;
-	int con = 0;
-
-	if (widget->inputs >= 0)
-		return widget->inputs;
-
-	DAPM_UPDATE_STAT(widget, path_checks);
-
-	if (widget->is_source && widget->connected) {
-		widget->inputs = snd_soc_dapm_suspend_check(widget);
-		return widget->inputs;
-	}
-
-	list_for_each_entry(path, &widget->sources, list_sink) {
-		DAPM_UPDATE_STAT(widget, neighbour_checks);
-
-		if (path->weak || path->is_supply)
-			continue;
-
-		if (path->walking)
-			return 1;
-
-		trace_snd_soc_dapm_input_path(widget, path);
-
-		if (path->connect) {
-			path->walking = 1;
-
-			/* do we need to add this widget to the list ? */
-			if (list) {
-				int err;
-				err = dapm_list_add_widget(list, path->source);
-				if (err < 0) {
-					dev_err(widget->dapm->dev,
-						"ASoC: could not add widget %s\n",
-						widget->name);
-					path->walking = 0;
-					return con;
-				}
-			}
-
-			con += is_connected_input_ep(path->source, list);
-
-			path->walking = 0;
-		}
-	}
-
-	widget->inputs = con;
-
-	return con;
+	return is_connected_ep(widget, list, SND_SOC_DAPM_DIR_IN,
+			is_connected_input_ep);
 }
 
 /**
@@ -1204,7 +1138,9 @@ int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
 {
 	struct snd_soc_card *card = dai->component->card;
 	struct snd_soc_dapm_widget *w;
+	LIST_HEAD(widgets);
 	int paths;
+	int ret;
 
 	mutex_lock_nested(&card->dapm_mutex, SND_SOC_DAPM_CLASS_RUNTIME);
 
@@ -1213,14 +1149,21 @@ int snd_soc_dapm_dai_get_connected_widgets(struct snd_soc_dai *dai, int stream,
 	 * to reset the cached number of inputs and outputs.
 	 */
 	list_for_each_entry(w, &card->widgets, list) {
-		w->inputs = -1;
-		w->outputs = -1;
+		w->endpoints[SND_SOC_DAPM_DIR_IN] = -1;
+		w->endpoints[SND_SOC_DAPM_DIR_OUT] = -1;
 	}
 
 	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
-		paths = is_connected_output_ep(dai->playback_widget, list);
+		paths = is_connected_output_ep(dai->playback_widget, &widgets);
 	else
-		paths = is_connected_input_ep(dai->capture_widget, list);
+		paths = is_connected_input_ep(dai->capture_widget, &widgets);
+
+	/* Drop starting point */
+	list_del(widgets.next);
+
+	ret = dapm_widget_list_create(list, &widgets);
+	if (ret)
+		paths = ret;
 
 	trace_snd_soc_dapm_connected(paths, stream);
 	mutex_unlock(&card->dapm_mutex);
@@ -1321,7 +1264,7 @@ static int dapm_supply_check_power(struct snd_soc_dapm_widget *w)
 	DAPM_UPDATE_STAT(w, power_checks);
 
 	/* Check if one of our outputs is connected */
-	list_for_each_entry(path, &w->sinks, list_source) {
+	snd_soc_dapm_widget_for_each_sink_path(w, path) {
 		DAPM_UPDATE_STAT(w, neighbour_checks);
 
 		if (path->weak)
@@ -1745,12 +1688,12 @@ static void dapm_widget_set_power(struct snd_soc_dapm_widget *w, bool power,
 	/* If we changed our power state perhaps our neigbours changed
 	 * also.
 	 */
-	list_for_each_entry(path, &w->sources, list_sink)
+	snd_soc_dapm_widget_for_each_source_path(w, path)
 		dapm_widget_set_peer_power(path->source, power, path->connect);
 
 	/* Supplies can't affect their outputs, only their inputs */
 	if (!w->is_supply) {
-		list_for_each_entry(path, &w->sinks, list_source)
+		snd_soc_dapm_widget_for_each_sink_path(w, path)
 			dapm_widget_set_peer_power(path->sink, power,
 						   path->connect);
 	}
@@ -1951,6 +1894,7 @@ static ssize_t dapm_widget_power_read_file(struct file *file,
 {
 	struct snd_soc_dapm_widget *w = file->private_data;
 	struct snd_soc_card *card = w->dapm->card;
+	enum snd_soc_dapm_direction dir, rdir;
 	char *buf;
 	int in, out;
 	ssize_t ret;
@@ -1987,25 +1931,21 @@ static ssize_t dapm_widget_power_read_file(struct file *file,
 				w->sname,
 				w->active ? "active" : "inactive");
 
-	list_for_each_entry(p, &w->sources, list_sink) {
-		if (p->connected && !p->connected(w, p->source))
-			continue;
+	snd_soc_dapm_for_each_direction(dir) {
+		rdir = SND_SOC_DAPM_DIR_REVERSE(dir);
+		snd_soc_dapm_widget_for_each_path(w, dir, p) {
+			if (p->connected && !p->connected(w, p->node[rdir]))
+				continue;
 
-		if (p->connect)
-			ret += snprintf(buf + ret, PAGE_SIZE - ret,
-					" in  \"%s\" \"%s\"\n",
-					p->name ? p->name : "static",
-					p->source->name);
-	}
-	list_for_each_entry(p, &w->sinks, list_source) {
-		if (p->connected && !p->connected(w, p->sink))
-			continue;
+			if (!p->connect)
+				continue;
 
-		if (p->connect)
 			ret += snprintf(buf + ret, PAGE_SIZE - ret,
-					" out \"%s\" \"%s\"\n",
+					" %s  \"%s\" \"%s\"\n",
+					(rdir == SND_SOC_DAPM_DIR_IN) ? "in" : "out",
 					p->name ? p->name : "static",
-					p->sink->name);
+					p->node[rdir]->name);
+		}
 	}
 
 	mutex_unlock(&card->dapm_mutex);
@@ -2305,37 +2245,43 @@ struct attribute *soc_dapm_dev_attrs[] = {
 
 static void dapm_free_path(struct snd_soc_dapm_path *path)
 {
-	list_del(&path->list_sink);
-	list_del(&path->list_source);
+	list_del(&path->list_node[SND_SOC_DAPM_DIR_IN]);
+	list_del(&path->list_node[SND_SOC_DAPM_DIR_OUT]);
 	list_del(&path->list_kcontrol);
 	list_del(&path->list);
 	kfree(path);
 }
 
+void snd_soc_dapm_free_widget(struct snd_soc_dapm_widget *w)
+{
+	struct snd_soc_dapm_path *p, *next_p;
+	enum snd_soc_dapm_direction dir;
+
+	list_del(&w->list);
+	/*
+	 * remove source and sink paths associated to this widget.
+	 * While removing the path, remove reference to it from both
+	 * source and sink widgets so that path is removed only once.
+	 */
+	snd_soc_dapm_for_each_direction(dir) {
+		snd_soc_dapm_widget_for_each_path_safe(w, dir, p, next_p)
+			dapm_free_path(p);
+	}
+
+	kfree(w->kcontrols);
+	kfree_const(w->name);
+	kfree(w);
+}
+
 /* free all dapm widgets and resources */
 static void dapm_free_widgets(struct snd_soc_dapm_context *dapm)
 {
 	struct snd_soc_dapm_widget *w, *next_w;
-	struct snd_soc_dapm_path *p, *next_p;
 
 	list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) {
 		if (w->dapm != dapm)
 			continue;
-		list_del(&w->list);
-		/*
-		 * remove source and sink paths associated to this widget.
-		 * While removing the path, remove reference to it from both
-		 * source and sink widgets so that path is removed only once.
-		 */
-		list_for_each_entry_safe(p, next_p, &w->sources, list_sink)
-			dapm_free_path(p);
-
-		list_for_each_entry_safe(p, next_p, &w->sinks, list_source)
-			dapm_free_path(p);
-
-		kfree(w->kcontrols);
-		kfree(w->name);
-		kfree(w);
+		snd_soc_dapm_free_widget(w);
 	}
 }
 
@@ -2441,20 +2387,22 @@ EXPORT_SYMBOL_GPL(snd_soc_dapm_sync);
  */
 static void dapm_update_widget_flags(struct snd_soc_dapm_widget *w)
 {
+	enum snd_soc_dapm_direction dir;
 	struct snd_soc_dapm_path *p;
+	unsigned int ep;
 
 	switch (w->id) {
 	case snd_soc_dapm_input:
 		/* On a fully routed card a input is never a source */
 		if (w->dapm->card->fully_routed)
-			break;
-		w->is_source = 1;
-		list_for_each_entry(p, &w->sources, list_sink) {
+			return;
+		ep = SND_SOC_DAPM_EP_SOURCE;
+		snd_soc_dapm_widget_for_each_source_path(w, p) {
 			if (p->source->id == snd_soc_dapm_micbias ||
 				p->source->id == snd_soc_dapm_mic ||
 				p->source->id == snd_soc_dapm_line ||
 				p->source->id == snd_soc_dapm_output) {
-					w->is_source = 0;
+					ep = 0;
 					break;
 			}
 		}
@@ -2462,25 +2410,30 @@ static void dapm_update_widget_flags(struct snd_soc_dapm_widget *w)
 	case snd_soc_dapm_output:
 		/* On a fully routed card a output is never a sink */
 		if (w->dapm->card->fully_routed)
-			break;
-		w->is_sink = 1;
-		list_for_each_entry(p, &w->sinks, list_source) {
+			return;
+		ep = SND_SOC_DAPM_EP_SINK;
+		snd_soc_dapm_widget_for_each_sink_path(w, p) {
 			if (p->sink->id == snd_soc_dapm_spk ||
 				p->sink->id == snd_soc_dapm_hp ||
 				p->sink->id == snd_soc_dapm_line ||
 				p->sink->id == snd_soc_dapm_input) {
-					w->is_sink = 0;
+					ep = 0;
 					break;
 			}
 		}
 		break;
 	case snd_soc_dapm_line:
-		w->is_sink = !list_empty(&w->sources);
-		w->is_source = !list_empty(&w->sinks);
+		ep = 0;
+		snd_soc_dapm_for_each_direction(dir) {
+			if (!list_empty(&w->edges[dir]))
+				ep |= SND_SOC_DAPM_DIR_TO_EP(dir);
+		}
 		break;
 	default:
-		break;
+		return;
 	}
+
+	w->is_ep = ep;
 }
 
 static int snd_soc_dapm_check_dynamic_path(struct snd_soc_dapm_context *dapm,
@@ -2533,6 +2486,8 @@ static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
 	int (*connected)(struct snd_soc_dapm_widget *source,
 			 struct snd_soc_dapm_widget *sink))
 {
+	struct snd_soc_dapm_widget *widgets[2];
+	enum snd_soc_dapm_direction dir;
 	struct snd_soc_dapm_path *path;
 	int ret;
 
@@ -2565,13 +2520,14 @@ static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
 	if (!path)
 		return -ENOMEM;
 
-	path->source = wsource;
-	path->sink = wsink;
+	path->node[SND_SOC_DAPM_DIR_IN] = wsource;
+	path->node[SND_SOC_DAPM_DIR_OUT] = wsink;
+	widgets[SND_SOC_DAPM_DIR_IN] = wsource;
+	widgets[SND_SOC_DAPM_DIR_OUT] = wsink;
+
 	path->connected = connected;
 	INIT_LIST_HEAD(&path->list);
 	INIT_LIST_HEAD(&path->list_kcontrol);
-	INIT_LIST_HEAD(&path->list_source);
-	INIT_LIST_HEAD(&path->list_sink);
 
 	if (wsource->is_supply || wsink->is_supply)
 		path->is_supply = 1;
@@ -2609,14 +2565,13 @@ static int snd_soc_dapm_add_path(struct snd_soc_dapm_context *dapm,
 	}
 
 	list_add(&path->list, &dapm->card->paths);
-	list_add(&path->list_sink, &wsink->sources);
-	list_add(&path->list_source, &wsource->sinks);
+	snd_soc_dapm_for_each_direction(dir)
+		list_add(&path->list_node[dir], &widgets[dir]->edges[dir]);
 
-	dapm_update_widget_flags(wsource);
-	dapm_update_widget_flags(wsink);
-
-	dapm_mark_dirty(wsource, "Route added");
-	dapm_mark_dirty(wsink, "Route added");
+	snd_soc_dapm_for_each_direction(dir) {
+		dapm_update_widget_flags(widgets[dir]);
+		dapm_mark_dirty(widgets[dir], "Route added");
+	}
 
 	if (dapm->card->instantiated && path->connect)
 		dapm_path_invalidate(path);
@@ -2864,7 +2819,7 @@ static int snd_soc_dapm_weak_route(struct snd_soc_dapm_context *dapm,
 		dev_warn(dapm->dev, "ASoC: Ignoring control for weak route %s->%s\n",
 			 route->source, route->sink);
 
-	list_for_each_entry(path, &source->sinks, list_source) {
+	snd_soc_dapm_widget_for_each_sink_path(source, path) {
 		if (path->sink == sink) {
 			path->weak = 1;
 			count++;
@@ -3298,6 +3253,7 @@ struct snd_soc_dapm_widget *
 snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
 			 const struct snd_soc_dapm_widget *widget)
 {
+	enum snd_soc_dapm_direction dir;
 	struct snd_soc_dapm_widget *w;
 	const char *prefix;
 	int ret;
@@ -3344,7 +3300,7 @@ snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
 	if (prefix)
 		w->name = kasprintf(GFP_KERNEL, "%s %s", prefix, widget->name);
 	else
-		w->name = kasprintf(GFP_KERNEL, "%s", widget->name);
+		w->name = kstrdup_const(widget->name, GFP_KERNEL);
 	if (w->name == NULL) {
 		kfree(w);
 		return NULL;
@@ -3352,27 +3308,27 @@ snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
 
 	switch (w->id) {
 	case snd_soc_dapm_mic:
-		w->is_source = 1;
+		w->is_ep = SND_SOC_DAPM_EP_SOURCE;
 		w->power_check = dapm_generic_check_power;
 		break;
 	case snd_soc_dapm_input:
 		if (!dapm->card->fully_routed)
-			w->is_source = 1;
+			w->is_ep = SND_SOC_DAPM_EP_SOURCE;
 		w->power_check = dapm_generic_check_power;
 		break;
 	case snd_soc_dapm_spk:
 	case snd_soc_dapm_hp:
-		w->is_sink = 1;
+		w->is_ep = SND_SOC_DAPM_EP_SINK;
 		w->power_check = dapm_generic_check_power;
 		break;
 	case snd_soc_dapm_output:
 		if (!dapm->card->fully_routed)
-			w->is_sink = 1;
+			w->is_ep = SND_SOC_DAPM_EP_SINK;
 		w->power_check = dapm_generic_check_power;
 		break;
 	case snd_soc_dapm_vmid:
 	case snd_soc_dapm_siggen:
-		w->is_source = 1;
+		w->is_ep = SND_SOC_DAPM_EP_SOURCE;
 		w->power_check = dapm_always_on_check_power;
 		break;
 	case snd_soc_dapm_mux:
@@ -3406,14 +3362,14 @@ snd_soc_dapm_new_control_unlocked(struct snd_soc_dapm_context *dapm,
 	}
 
 	w->dapm = dapm;
-	INIT_LIST_HEAD(&w->sources);
-	INIT_LIST_HEAD(&w->sinks);
 	INIT_LIST_HEAD(&w->list);
 	INIT_LIST_HEAD(&w->dirty);
 	list_add_tail(&w->list, &dapm->card->widgets);
 
-	w->inputs = -1;
-	w->outputs = -1;
+	snd_soc_dapm_for_each_direction(dir) {
+		INIT_LIST_HEAD(&w->edges[dir]);
+		w->endpoints[dir] = -1;
+	}
 
 	/* machine layer set ups unconnected pins and insertions */
 	w->connected = 1;
@@ -3467,19 +3423,17 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
 	int ret;
 
 	if (WARN_ON(!config) ||
-	    WARN_ON(list_empty(&w->sources) || list_empty(&w->sinks)))
+	    WARN_ON(list_empty(&w->edges[SND_SOC_DAPM_DIR_OUT]) ||
+		    list_empty(&w->edges[SND_SOC_DAPM_DIR_IN])))
 		return -EINVAL;
 
 	/* We only support a single source and sink, pick the first */
-	source_p = list_first_entry(&w->sources, struct snd_soc_dapm_path,
-				    list_sink);
-	sink_p = list_first_entry(&w->sinks, struct snd_soc_dapm_path,
-				  list_source);
-
-	if (WARN_ON(!source_p || !sink_p) ||
-	    WARN_ON(!sink_p->source || !source_p->sink) ||
-	    WARN_ON(!source_p->source || !sink_p->sink))
-		return -EINVAL;
+	source_p = list_first_entry(&w->edges[SND_SOC_DAPM_DIR_OUT],
+				    struct snd_soc_dapm_path,
+				    list_node[SND_SOC_DAPM_DIR_OUT]);
+	sink_p = list_first_entry(&w->edges[SND_SOC_DAPM_DIR_IN],
+				    struct snd_soc_dapm_path,
+				    list_node[SND_SOC_DAPM_DIR_IN]);
 
 	source = source_p->source->priv;
 	sink = sink_p->sink->priv;
@@ -3851,6 +3805,7 @@ static void soc_dapm_dai_stream_event(struct snd_soc_dai *dai, int stream,
 	int event)
 {
 	struct snd_soc_dapm_widget *w;
+	unsigned int ep;
 
 	if (stream == SNDRV_PCM_STREAM_PLAYBACK)
 		w = dai->playback_widget;
@@ -3860,12 +3815,22 @@ static void soc_dapm_dai_stream_event(struct snd_soc_dai *dai, int stream,
 	if (w) {
 		dapm_mark_dirty(w, "stream event");
 
+		if (w->id == snd_soc_dapm_dai_in) {
+			ep = SND_SOC_DAPM_EP_SOURCE;
+			dapm_widget_invalidate_input_paths(w);
+		} else {
+			ep = SND_SOC_DAPM_EP_SINK;
+			dapm_widget_invalidate_output_paths(w);
+		}
+
 		switch (event) {
 		case SND_SOC_DAPM_STREAM_START:
 			w->active = 1;
+			w->is_ep = ep;
 			break;
 		case SND_SOC_DAPM_STREAM_STOP:
 			w->active = 0;
+			w->is_ep = 0;
 			break;
 		case SND_SOC_DAPM_STREAM_SUSPEND:
 		case SND_SOC_DAPM_STREAM_RESUME:
@@ -3873,14 +3838,6 @@ static void soc_dapm_dai_stream_event(struct snd_soc_dai *dai, int stream,
 		case SND_SOC_DAPM_STREAM_PAUSE_RELEASE:
 			break;
 		}
-
-		if (w->id == snd_soc_dapm_dai_in) {
-			w->is_source = w->active;
-			dapm_widget_invalidate_input_paths(w);
-		} else {
-			w->is_sink = w->active;
-			dapm_widget_invalidate_output_paths(w);
-		}
 	}
 }
 
diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 256b9c91aa94..7aed170f31bc 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1231,24 +1231,17 @@ static int widget_in_list(struct snd_soc_dapm_widget_list *list,
 }
 
 int dpcm_path_get(struct snd_soc_pcm_runtime *fe,
-	int stream, struct snd_soc_dapm_widget_list **list_)
+	int stream, struct snd_soc_dapm_widget_list **list)
 {
 	struct snd_soc_dai *cpu_dai = fe->cpu_dai;
-	struct snd_soc_dapm_widget_list *list;
 	int paths;
 
-	list = kzalloc(sizeof(struct snd_soc_dapm_widget_list) +
-			sizeof(struct snd_soc_dapm_widget *), GFP_KERNEL);
-	if (list == NULL)
-		return -ENOMEM;
-
 	/* get number of valid DAI paths and their widgets */
-	paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, &list);
+	paths = snd_soc_dapm_dai_get_connected_widgets(cpu_dai, stream, list);
 
 	dev_dbg(fe->dev, "ASoC: found %d audio %s paths\n", paths,
 			stream ? "capture" : "playback");
 
-	*list_ = list;
 	return paths;
 }
 
diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 31068b8f3db0..f4e92d35316e 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -1758,7 +1758,6 @@ void snd_soc_tplg_widget_remove_all(struct snd_soc_dapm_context *dapm,
 	u32 index)
 {
 	struct snd_soc_dapm_widget *w, *next_w;
-	struct snd_soc_dapm_path *p, *next_p;
 
 	list_for_each_entry_safe(w, next_w, &dapm->card->widgets, list) {
 
@@ -1770,31 +1769,9 @@ void snd_soc_tplg_widget_remove_all(struct snd_soc_dapm_context *dapm,
 		if (w->dobj.index != index &&
 			w->dobj.index != SND_SOC_TPLG_INDEX_ALL)
 			continue;
-
-		list_del(&w->list);
-
-		/*
-		 * remove source and sink paths associated to this widget.
-		 * While removing the path, remove reference to it from both
-		 * source and sink widgets so that path is removed only once.
-		 */
-		list_for_each_entry_safe(p, next_p, &w->sources, list_sink) {
-			list_del(&p->list_sink);
-			list_del(&p->list_source);
-			list_del(&p->list);
-			kfree(p);
-		}
-		list_for_each_entry_safe(p, next_p, &w->sinks, list_source) {
-			list_del(&p->list_sink);
-			list_del(&p->list_source);
-			list_del(&p->list);
-			kfree(p);
-		}
 		/* check and free and dynamic widget kcontrols */
 		snd_soc_tplg_widget_remove(w);
-		kfree(w->kcontrols);
-		kfree(w->name);
-		kfree(w);
+		snd_soc_dapm_free_widget(w);
 	}
 }
 EXPORT_SYMBOL_GPL(snd_soc_tplg_widget_remove_all);