ASoC: dapm: Reduce number of checked paths in dapm_widget_in_card_paths()

Each widget has a list of all the paths that it is connected to. There is no
need to iterate over all paths when we are only interested in the paths of a
specific widget.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-dapm.c

@@ -3788,27 +3788,30 @@ int snd_soc_dapm_ignore_suspend(struct snd_soc_dapm_context *dapm,
 }
 EXPORT_SYMBOL_GPL(snd_soc_dapm_ignore_suspend);
 
-static bool snd_soc_dapm_widget_in_card_paths(struct snd_soc_card *card,
-					      struct snd_soc_dapm_widget *w)
+/**
+ * dapm_is_external_path() - Checks if a path is a external path
+ * @card: The card the path belongs to
+ * @path: The path to check
+ *
+ * Returns true if the path is either between two different DAPM contexts or
+ * between two external pins of the same DAPM context. Otherwise returns
+ * false.
+ */
+static bool dapm_is_external_path(struct snd_soc_card *card,
+	struct snd_soc_dapm_path *path)
 {
-	struct snd_soc_dapm_path *p;
-
-	list_for_each_entry(p, &card->paths, list) {
-		if ((p->source == w) || (p->sink == w)) {
 	dev_dbg(card->dev,
 		"... Path %s(id:%d dapm:%p) - %s(id:%d dapm:%p)\n",
-			    p->source->name, p->source->id, p->source->dapm,
-			    p->sink->name, p->sink->id, p->sink->dapm);
+		path->source->name, path->source->id, path->source->dapm,
+		path->sink->name, path->sink->id, path->sink->dapm);
 
-			/* Connected to something other than the codec */
-			if (p->source->dapm != p->sink->dapm)
+	/* Connection between two different DAPM contexts */
+	if (path->source->dapm != path->sink->dapm)
 		return true;
-			/*
-			 * Loopback connection from codec external pin to
-			 * codec external pin
-			 */
-			if (p->sink->id == snd_soc_dapm_input) {
-				switch (p->source->id) {
+
+	/* Loopback connection from external pin to external pin */
+	if (path->sink->id == snd_soc_dapm_input) {
+		switch (path->source->id) {
 		case snd_soc_dapm_output:
 		case snd_soc_dapm_micbias:
 			return true;
@@ -3816,7 +3819,23 @@ static bool snd_soc_dapm_widget_in_card_paths(struct snd_soc_card *card,
 			break;
 		}
 	}
+
+	return false;
+}
+
+static bool snd_soc_dapm_widget_in_card_paths(struct snd_soc_card *card,
+					      struct snd_soc_dapm_widget *w)
+{
+	struct snd_soc_dapm_path *p;
+
+	list_for_each_entry(p, &w->sources, list_sink) {
+		if (dapm_is_external_path(card, p))
+			return true;
 	}
+
+	list_for_each_entry(p, &w->sinks, list_source) {
+		if (dapm_is_external_path(card, p))
+			return true;
 	}
 
 	return false;