Applied "ASoC: codec2codec: remove ephemeral variables" to the asoc tree

[Mark Brown <broonie@kernel.org>]

The patch

   ASoC: codec2codec: remove ephemeral variables

has been applied to the asoc tree at

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-5.4

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

From a72706ed8208ac3f72d1c3ebbc6509e368b0dcb0 Mon Sep 17 00:00:00 2001
From: Jerome Brunet <jbrunet@baylibre.com>
Date: Thu, 25 Jul 2019 18:59:48 +0200
Subject: [PATCH] ASoC: codec2codec: remove ephemeral variables

Now that codec to codec links struct snd_soc_pcm_runtime have lasting pcm
and substreams, let's use them. Alsa allocate and keep the
struct snd_pcm_runtime as long as the link is powered.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20190725165949.29699-6-jbrunet@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/soc-dapm.c | 72 ++++++++++++++++++++++++++------------------
 1 file changed, 42 insertions(+), 30 deletions(-)

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index 2d183e2d23de..1c953a1b46ce 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -3775,6 +3775,7 @@ snd_soc_dai_link_event_pre_pmu(struct snd_soc_dapm_widget *w,
 	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_pcm_hw_params *params = NULL;
 	const struct snd_soc_pcm_stream *config = NULL;
+	struct snd_pcm_runtime *runtime = NULL;
 	unsigned int fmt;
 	int ret = 0;
 
@@ -3782,6 +3783,14 @@ snd_soc_dai_link_event_pre_pmu(struct snd_soc_dapm_widget *w,
 	if (!params)
 		return -ENOMEM;
 
+	runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
+	if (!runtime) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	substream->runtime = runtime;
+
 	substream->stream = SNDRV_PCM_STREAM_CAPTURE;
 	snd_soc_dapm_widget_for_each_source_path(w, path) {
 		source = path->source->priv;
@@ -3808,6 +3817,8 @@ snd_soc_dai_link_event_pre_pmu(struct snd_soc_dapm_widget *w,
 		sink->active++;
 	}
 
+	substream->hw_opened = 1;
+
 	/*
 	 * Note: getting the config after .startup() gives a chance to
 	 * either party on the link to alter the configuration if
@@ -3864,6 +3875,9 @@ snd_soc_dai_link_event_pre_pmu(struct snd_soc_dapm_widget *w,
 	}
 
 out:
+	if (ret < 0)
+		kfree(runtime);
+
 	kfree(params);
 	return ret;
 }
@@ -3873,29 +3887,16 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
 {
 	struct snd_soc_dapm_path *path;
 	struct snd_soc_dai *source, *sink;
-	struct snd_soc_pcm_runtime *rtd = w->priv;
-	struct snd_pcm_substream substream;
-	struct snd_pcm_runtime *runtime = NULL;
-	int ret = 0;
+	struct snd_pcm_substream *substream = w->priv;
+	int ret = 0, saved_stream = substream->stream;
 
 	if (WARN_ON(list_empty(&w->edges[SND_SOC_DAPM_DIR_OUT]) ||
 		    list_empty(&w->edges[SND_SOC_DAPM_DIR_IN])))
 		return -EINVAL;
 
-	memset(&substream, 0, sizeof(substream));
-
-	/* Allocate a dummy snd_pcm_runtime for startup() and other ops() */
-	runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
-	if (!runtime) {
-		ret = -ENOMEM;
-		goto out;
-	}
-	substream.runtime = runtime;
-	substream.private_data = rtd;
-
 	switch (event) {
 	case SND_SOC_DAPM_PRE_PMU:
-		ret = snd_soc_dai_link_event_pre_pmu(w, &substream);
+		ret = snd_soc_dai_link_event_pre_pmu(w, substream);
 		if (ret < 0)
 			goto out;
 
@@ -3926,40 +3927,45 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
 			ret = 0;
 		}
 
-		substream.stream = SNDRV_PCM_STREAM_CAPTURE;
+		substream->stream = SNDRV_PCM_STREAM_CAPTURE;
 		snd_soc_dapm_widget_for_each_source_path(w, path) {
 			source = path->source->priv;
-			snd_soc_dai_hw_free(source, &substream);
+			snd_soc_dai_hw_free(source, substream);
 		}
 
-		substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
+		substream->stream = SNDRV_PCM_STREAM_PLAYBACK;
 		snd_soc_dapm_widget_for_each_sink_path(w, path) {
 			sink = path->sink->priv;
-			snd_soc_dai_hw_free(sink, &substream);
+			snd_soc_dai_hw_free(sink, substream);
 		}
 
-		substream.stream = SNDRV_PCM_STREAM_CAPTURE;
+		substream->stream = SNDRV_PCM_STREAM_CAPTURE;
 		snd_soc_dapm_widget_for_each_source_path(w, path) {
 			source = path->source->priv;
 			source->active--;
-			snd_soc_dai_shutdown(source, &substream);
+			snd_soc_dai_shutdown(source, substream);
 		}
 
-		substream.stream = SNDRV_PCM_STREAM_PLAYBACK;
+		substream->stream = SNDRV_PCM_STREAM_PLAYBACK;
 		snd_soc_dapm_widget_for_each_sink_path(w, path) {
 			sink = path->sink->priv;
 			sink->active--;
-			snd_soc_dai_shutdown(sink, &substream);
+			snd_soc_dai_shutdown(sink, substream);
 		}
 		break;
 
+	case SND_SOC_DAPM_POST_PMD:
+		kfree(substream->runtime);
+		break;
+
 	default:
 		WARN(1, "Unknown event %d\n", event);
 		ret = -EINVAL;
 	}
 
 out:
-	kfree(runtime);
+	/* Restore the substream direction */
+	substream->stream = saved_stream;
 	return ret;
 }
 
@@ -4082,9 +4088,11 @@ snd_soc_dapm_alloc_kcontrol(struct snd_soc_card *card,
 }
 
 static struct snd_soc_dapm_widget *
-snd_soc_dapm_new_dai(struct snd_soc_card *card, struct snd_soc_pcm_runtime *rtd,
+snd_soc_dapm_new_dai(struct snd_soc_card *card,
+		     struct snd_pcm_substream *substream,
 		     char *id)
 {
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
 	struct snd_soc_dapm_widget template;
 	struct snd_soc_dapm_widget *w;
 	const char **w_param_text;
@@ -4103,7 +4111,7 @@ snd_soc_dapm_new_dai(struct snd_soc_card *card, struct snd_soc_pcm_runtime *rtd,
 	template.name = link_name;
 	template.event = snd_soc_dai_link_event;
 	template.event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
-		SND_SOC_DAPM_PRE_PMD;
+		SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMD;
 	template.kcontrol_news = NULL;
 
 	/* allocate memory for control, only in case of multiple configs */
@@ -4138,7 +4146,7 @@ snd_soc_dapm_new_dai(struct snd_soc_card *card, struct snd_soc_pcm_runtime *rtd,
 		goto outfree_kcontrol_news;
 	}
 
-	w->priv = rtd;
+	w->priv = substream;
 
 	return w;
 
@@ -4260,6 +4268,8 @@ static void dapm_connect_dai_link_widgets(struct snd_soc_card *card,
 	struct snd_soc_dai *codec_dai;
 	struct snd_soc_dapm_widget *playback = NULL, *capture = NULL;
 	struct snd_soc_dapm_widget *codec, *playback_cpu, *capture_cpu;
+	struct snd_pcm_substream *substream;
+	struct snd_pcm_str *streams = rtd->pcm->streams;
 	int i;
 
 	if (rtd->dai_link->params) {
@@ -4278,7 +4288,8 @@ static void dapm_connect_dai_link_widgets(struct snd_soc_card *card,
 
 		if (playback_cpu && codec) {
 			if (!playback) {
-				playback = snd_soc_dapm_new_dai(card, rtd,
+				substream = streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
+				playback = snd_soc_dapm_new_dai(card, substream,
 								"playback");
 				if (IS_ERR(playback)) {
 					dev_err(rtd->dev,
@@ -4307,7 +4318,8 @@ static void dapm_connect_dai_link_widgets(struct snd_soc_card *card,
 
 		if (codec && capture_cpu) {
 			if (!capture) {
-				capture = snd_soc_dapm_new_dai(card, rtd,
+				substream = streams[SNDRV_PCM_STREAM_CAPTURE].substream;
+				capture = snd_soc_dapm_new_dai(card, substream,
 							       "capture");
 				if (IS_ERR(capture)) {
 					dev_err(rtd->dev,
-- 
2.20.1


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