diff mbox

[Resend,v1,3/4] ASoC: dapm: Avoid creating kcontrol for params

Message ID 1506066940-56758-1-git-send-email-yesanishhere@gmail.com (mailing list archive)
State New, archived
Headers show

Commit Message

Anish Kumar Sept. 22, 2017, 7:55 a.m. UTC 
From: anish kumar <yesanishhere@gmail.com>

Currently in codec to codec dai link if there are multiple
params defined then dapm can use created kcontrol to
decide which param to apply at runtime.

However, in case there is only single param configuration
then there is no point in creating the kcontrol and also there
is no point in allocating memory for kcontrol.

In the snd_soc_dapm_new_pcm function, there is memory
allocation happening for kcontrol which is later used
or not used based on num_param. It is better to not
allocate memory when there is only a single configuration.
This change is to remedy that anomaly.

Signed-off-by: anish kumar <yesanishhere@gmail.com>
---
Changes in v1:
  - Included the review comments from charles regarding
    releasing memory in error path.

 sound/soc/soc-dapm.c | 130 ++++++++++++++++++++++++++++++---------------------
 1 file changed, 78 insertions(+), 52 deletions(-)

Comments

Mark Brown Sept. 22, 2017, 9:19 a.m. UTC | #1 
On Fri, Sep 22, 2017 at 12:55:40AM -0700, yesanishhere@gmail.com wrote:
> From: anish kumar <yesanishhere@gmail.com>
> 
> Currently in codec to codec dai link if there are multiple
> params defined then dapm can use created kcontrol to
> decide which param to apply at runtime.

You've sent me patch 3/4 and only patch 3/4.  What's going on with the
other three patches?  Please remember that the entire purpose of
numbering patches is to order them in a series, if you're not sending a
series there's no need to number things and if you're sending a series
the numbering should reflect what you're sending now, not any previous
versions of the patches.
Anish Kumar Sept. 22, 2017, 4:16 p.m. UTC | #2 
> On Sep 22, 2017, at 2:19 AM, Mark Brown <broonie@kernel.org> wrote:
> 
>> On Fri, Sep 22, 2017 at 12:55:40AM -0700, yesanishhere@gmail.com wrote:
>> From: anish kumar <yesanishhere@gmail.com>
>> 
>> Currently in codec to codec dai link if there are multiple
>> params defined then dapm can use created kcontrol to
>> decide which param to apply at runtime.
> 
> You've sent me patch 3/4 and only patch 3/4.

Other patches are already reviewed by Charles and he had comment for 3/4 patch so I sent only that.
>  What's going on with the
> other three patches?  Please remember that the entire purpose of
> numbering patches is to order them in a series, if you're not sending a
> series there's no need to number things and if

Got it. Will keep that in mind for future.
> you're sending a series
> the numbering should reflect what you're sending now, not any previous
> versions of the patches.
Charles Keepax Sept. 25, 2017, 1:09 p.m. UTC | #3 
On Fri, Sep 22, 2017 at 12:55:40AM -0700, yesanishhere@gmail.com wrote:
> From: anish kumar <yesanishhere@gmail.com>
> 
> Currently in codec to codec dai link if there are multiple
> params defined then dapm can use created kcontrol to
> decide which param to apply at runtime.
> 
> However, in case there is only single param configuration
> then there is no point in creating the kcontrol and also there
> is no point in allocating memory for kcontrol.
> 
> In the snd_soc_dapm_new_pcm function, there is memory
> allocation happening for kcontrol which is later used
> or not used based on num_param. It is better to not
> allocate memory when there is only a single configuration.
> This change is to remedy that anomaly.
> 
> Signed-off-by: anish kumar <yesanishhere@gmail.com>
> ---
<snip>
> +int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
> +			 const struct snd_soc_pcm_stream *params,
> +			 unsigned int num_params,
> +			 struct snd_soc_dapm_widget *source,
> +			 struct snd_soc_dapm_widget *sink)
> +{
> +	struct snd_soc_dapm_widget template;
> +	struct snd_soc_dapm_widget *w;
> +	const char **w_param_text;
> +	unsigned long private_value;
> +	char *link_name;
> +	int ret, count;
> +
> +	link_name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-%s",
> +				   source->name, sink->name);
> +	if (!link_name)
> +		return -ENOMEM;
> +
> +	memset(&template, 0, sizeof(template));
> +	template.reg = SND_SOC_NOPM;
> +	template.id = snd_soc_dapm_dai_link;
> +	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;
> +	template.kcontrol_news = NULL;
> +
> +	w_param_text = devm_kcalloc(card->dev, num_params,
> +				sizeof(char *), GFP_KERNEL);
> +	if (!w_param_text) {
> +		ret = -ENOMEM;
> +		goto param_fail;
> +	}

Should this not also be done conditionally based on num_params?
Seems odd to do all this to avoid allocations but then alloc this
regardless of if it is used.

> +
> +	/* allocate memory for control, only in case of multiple configs */
> +	if (num_params > 1) {
> +		template.num_kcontrols = 1;
> +		template.kcontrol_news =
> +					snd_soc_dapm_alloc_kcontrol(card,
> +						link_name, params, num_params,
> +						w_param_text, &private_value);
> +		if (!template.kcontrol_news) {
> +			ret = -ENOMEM;
> +			goto outfree_link_name;
> +		}
> +	}
>  	dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
>  
>  	w = snd_soc_dapm_new_control_unlocked(&card->dapm, &template);
> @@ -3899,15 +3927,13 @@ int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
>  	devm_kfree(card->dev, w);
>  outfree_kcontrol_news:
>  	devm_kfree(card->dev, (void *)template.kcontrol_news);
> -outfree_private_value:
>  	devm_kfree(card->dev, (void *)private_value);
> -outfree_link_name:
> -	devm_kfree(card->dev, link_name);
>  	for (count = 0 ; count < num_params; count++)
>  		devm_kfree(card->dev, (void *)w_param_text[count]);

Do we maybe just want to add a snd_soc_dapm_free_kcontrol or some
such and call that from both places rather than having basically
the same error path in snd_soc_dapm_alloc_kcontrol and here.

> -outfree_w_param:
> +outfree_link_name:
>  	devm_kfree(card->dev, w_param_text);
> -
> +param_fail:
> +	devm_kfree(card->dev, link_name);
>  	return ret;
>  }
>  
> -- 
> 2.5.4 (Apple Git-61)

Thanks,
Charles
Anish Kumar Sept. 25, 2017, 8:22 p.m. UTC | #4 
On Mon, Sep 25, 2017 at 6:09 AM, Charles Keepax
<ckeepax@opensource.cirrus.com> wrote:
> On Fri, Sep 22, 2017 at 12:55:40AM -0700, yesanishhere@gmail.com wrote:
>> From: anish kumar <yesanishhere@gmail.com>
>>
>> Currently in codec to codec dai link if there are multiple
>> params defined then dapm can use created kcontrol to
>> decide which param to apply at runtime.
>>
>> However, in case there is only single param configuration
>> then there is no point in creating the kcontrol and also there
>> is no point in allocating memory for kcontrol.
>>
>> In the snd_soc_dapm_new_pcm function, there is memory
>> allocation happening for kcontrol which is later used
>> or not used based on num_param. It is better to not
>> allocate memory when there is only a single configuration.
>> This change is to remedy that anomaly.
>>
>> Signed-off-by: anish kumar <yesanishhere@gmail.com>
>> ---
> <snip>
>> +int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
>> +                      const struct snd_soc_pcm_stream *params,
>> +                      unsigned int num_params,
>> +                      struct snd_soc_dapm_widget *source,
>> +                      struct snd_soc_dapm_widget *sink)
>> +{
>> +     struct snd_soc_dapm_widget template;
>> +     struct snd_soc_dapm_widget *w;
>> +     const char **w_param_text;
>> +     unsigned long private_value;
>> +     char *link_name;
>> +     int ret, count;
>> +
>> +     link_name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-%s",
>> +                                source->name, sink->name);
>> +     if (!link_name)
>> +             return -ENOMEM;
>> +
>> +     memset(&template, 0, sizeof(template));
>> +     template.reg = SND_SOC_NOPM;
>> +     template.id = snd_soc_dapm_dai_link;
>> +     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;
>> +     template.kcontrol_news = NULL;
>> +
>> +     w_param_text = devm_kcalloc(card->dev, num_params,
>> +                             sizeof(char *), GFP_KERNEL);
>> +     if (!w_param_text) {
>> +             ret = -ENOMEM;
>> +             goto param_fail;
>> +     }
>
> Should this not also be done conditionally based on num_params?
> Seems odd to do all this to avoid allocations but then alloc this
> regardless of if it is used.

Nice catch.
>
>> +
>> +     /* allocate memory for control, only in case of multiple configs */
>> +     if (num_params > 1) {
>> +             template.num_kcontrols = 1;
>> +             template.kcontrol_news =
>> +                                     snd_soc_dapm_alloc_kcontrol(card,
>> +                                             link_name, params, num_params,
>> +                                             w_param_text, &private_value);
>> +             if (!template.kcontrol_news) {
>> +                     ret = -ENOMEM;
>> +                     goto outfree_link_name;
>> +             }
>> +     }
>>       dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
>>
>>       w = snd_soc_dapm_new_control_unlocked(&card->dapm, &template);
>> @@ -3899,15 +3927,13 @@ int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
>>       devm_kfree(card->dev, w);
>>  outfree_kcontrol_news:
>>       devm_kfree(card->dev, (void *)template.kcontrol_news);
>> -outfree_private_value:
>>       devm_kfree(card->dev, (void *)private_value);
>> -outfree_link_name:
>> -     devm_kfree(card->dev, link_name);
>>       for (count = 0 ; count < num_params; count++)
>>               devm_kfree(card->dev, (void *)w_param_text[count]);
>
> Do we maybe just want to add a snd_soc_dapm_free_kcontrol or some
> such and call that from both places rather than having basically
> the same error path in snd_soc_dapm_alloc_kcontrol and here.

Sure. Let me re-spin it.
>
>> -outfree_w_param:
>> +outfree_link_name:
>>       devm_kfree(card->dev, w_param_text);
>> -
>> +param_fail:
>> +     devm_kfree(card->dev, link_name);
>>       return ret;
>>  }
>>
>> --
>> 2.5.4 (Apple Git-61)
>
> Thanks,
> Charles
diff mbox

Patch

diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
index d55cac6..e659c74 100644
--- a/sound/soc/soc-dapm.c
+++ b/sound/soc/soc-dapm.c
@@ -3778,18 +3778,13 @@  static int snd_soc_dapm_dai_link_put(struct snd_kcontrol *kcontrol,
 	return 0;
 }
 
-int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
-			 const struct snd_soc_pcm_stream *params,
-			 unsigned int num_params,
-			 struct snd_soc_dapm_widget *source,
-			 struct snd_soc_dapm_widget *sink)
+static struct snd_kcontrol_new *
+snd_soc_dapm_alloc_kcontrol(struct snd_soc_card *card,
+			char *link_name,
+			const struct snd_soc_pcm_stream *params,
+			int num_params, const char **w_param_text,
+			unsigned long *private_value)
 {
-	struct snd_soc_dapm_widget template;
-	struct snd_soc_dapm_widget *w;
-	char *link_name;
-	int ret, count;
-	unsigned long private_value;
-	const char **w_param_text;
 	struct soc_enum w_param_enum[] = {
 		SOC_ENUM_SINGLE(0, 0, 0, NULL),
 	};
@@ -3798,19 +3793,9 @@  int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
 			     snd_soc_dapm_dai_link_get,
 			     snd_soc_dapm_dai_link_put),
 	};
+	struct snd_kcontrol_new *kcontrol_news;
 	const struct snd_soc_pcm_stream *config = params;
-
-	w_param_text = devm_kcalloc(card->dev, num_params,
-					sizeof(char *), GFP_KERNEL);
-	if (!w_param_text)
-		return -ENOMEM;
-
-	link_name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-%s",
-				   source->name, sink->name);
-	if (!link_name) {
-		ret = -ENOMEM;
-		goto outfree_w_param;
-	}
+	int count;
 
 	for (count = 0 ; count < num_params; count++) {
 		if (!config->stream_name) {
@@ -3827,47 +3812,90 @@  int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
 						strlen(config->stream_name) + 1,
 						GFP_KERNEL);
 		}
-		if (!w_param_text[count]) {
-			ret = -ENOMEM;
-			goto outfree_link_name;
-		}
+		if (!w_param_text[count])
+			goto outfree_w_param;
 		config++;
 	}
+
 	w_param_enum[0].items = num_params;
 	w_param_enum[0].texts = w_param_text;
 
-	memset(&template, 0, sizeof(template));
-	template.reg = SND_SOC_NOPM;
-	template.id = snd_soc_dapm_dai_link;
-	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;
-	template.num_kcontrols = 1;
-	/* duplicate w_param_enum on heap so that memory persists */
-	private_value =
+	*private_value =
 		(unsigned long) devm_kmemdup(card->dev,
 			(void *)(kcontrol_dai_link[0].private_value),
 			sizeof(struct soc_enum), GFP_KERNEL);
-	if (!private_value) {
+	if (!*private_value) {
 		dev_err(card->dev, "ASoC: Failed to create control for %s widget\n",
 			link_name);
-		ret = -ENOMEM;
-		goto outfree_link_name;
+		goto outfree_w_param;
 	}
-	kcontrol_dai_link[0].private_value = private_value;
+	kcontrol_dai_link[0].private_value = *private_value;
 	/* duplicate kcontrol_dai_link on heap so that memory persists */
-	template.kcontrol_news =
-				devm_kmemdup(card->dev, &kcontrol_dai_link[0],
-					sizeof(struct snd_kcontrol_new),
-					GFP_KERNEL);
-	if (!template.kcontrol_news) {
+	kcontrol_news =
+			devm_kmemdup(card->dev, &kcontrol_dai_link[0],
+				sizeof(struct snd_kcontrol_new),
+				GFP_KERNEL);
+	if (!kcontrol_news) {
 		dev_err(card->dev, "ASoC: Failed to create control for %s widget\n",
 			link_name);
-		ret = -ENOMEM;
 		goto outfree_private_value;
 	}
+	return kcontrol_news;
+
+outfree_private_value:
+	devm_kfree(card->dev, (void *)*private_value);
+outfree_w_param:
+	for (count = 0 ; count < num_params; count++)
+		devm_kfree(card->dev, (void *)w_param_text[count]);
+	return NULL;
+}
 
+int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
+			 const struct snd_soc_pcm_stream *params,
+			 unsigned int num_params,
+			 struct snd_soc_dapm_widget *source,
+			 struct snd_soc_dapm_widget *sink)
+{
+	struct snd_soc_dapm_widget template;
+	struct snd_soc_dapm_widget *w;
+	const char **w_param_text;
+	unsigned long private_value;
+	char *link_name;
+	int ret, count;
+
+	link_name = devm_kasprintf(card->dev, GFP_KERNEL, "%s-%s",
+				   source->name, sink->name);
+	if (!link_name)
+		return -ENOMEM;
+
+	memset(&template, 0, sizeof(template));
+	template.reg = SND_SOC_NOPM;
+	template.id = snd_soc_dapm_dai_link;
+	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;
+	template.kcontrol_news = NULL;
+
+	w_param_text = devm_kcalloc(card->dev, num_params,
+				sizeof(char *), GFP_KERNEL);
+	if (!w_param_text) {
+		ret = -ENOMEM;
+		goto param_fail;
+	}
+
+	/* allocate memory for control, only in case of multiple configs */
+	if (num_params > 1) {
+		template.num_kcontrols = 1;
+		template.kcontrol_news =
+					snd_soc_dapm_alloc_kcontrol(card,
+						link_name, params, num_params,
+						w_param_text, &private_value);
+		if (!template.kcontrol_news) {
+			ret = -ENOMEM;
+			goto outfree_link_name;
+		}
+	}
 	dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
 
 	w = snd_soc_dapm_new_control_unlocked(&card->dapm, &template);
@@ -3899,15 +3927,13 @@  int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
 	devm_kfree(card->dev, w);
 outfree_kcontrol_news:
 	devm_kfree(card->dev, (void *)template.kcontrol_news);
-outfree_private_value:
 	devm_kfree(card->dev, (void *)private_value);
-outfree_link_name:
-	devm_kfree(card->dev, link_name);
 	for (count = 0 ; count < num_params; count++)
 		devm_kfree(card->dev, (void *)w_param_text[count]);
-outfree_w_param:
+outfree_link_name:
 	devm_kfree(card->dev, w_param_text);
-
+param_fail:
+	devm_kfree(card->dev, link_name);
 	return ret;
 }