Re: [alsa-devel] [PATCH v2 11/11] ASoC: topology: Consolidate and fix asoc_tplg_dapm_widget_*_create flow

[Ranjani Sridharan <ranjani.sridharan@linux.intel.com>]

On Mon, 2019-06-17 at 13:36 +0200, Amadeusz Sławiński wrote:
> There are a few soc_tplg_dapm_widget_*_create functions with similar
> content, but slightly different flow, unify their flow and make sure
> that we go to error handler and free memory in case of failure.
> 
> Signed-off-by: Amadeusz Sławiński <
> amadeuszx.slawinski@linux.intel.com>
Acked-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>

I'm good with all the patches in the series.

Thanks,
Ranjani

> ---
>  sound/soc/soc-topology.c | 77 ++++++++++++++++++------------------
> ----
>  1 file changed, 35 insertions(+), 42 deletions(-)
> 
> diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
> index a926c2afbe05..fc1f1d6f9e92 100644
> --- a/sound/soc/soc-topology.c
> +++ b/sound/soc/soc-topology.c
> @@ -1310,14 +1310,15 @@ static struct snd_kcontrol_new
> *soc_tplg_dapm_widget_dmixer_create(
>  
>  	for (i = 0; i < num_kcontrols; i++) {
>  		mc = (struct snd_soc_tplg_mixer_control *)tplg->pos;
> -		sm = kzalloc(sizeof(*sm), GFP_KERNEL);
> -		if (sm == NULL)
> -			goto err;
>  
>  		/* validate kcontrol */
>  		if (strnlen(mc->hdr.name,
> SNDRV_CTL_ELEM_ID_NAME_MAXLEN) ==
>  			SNDRV_CTL_ELEM_ID_NAME_MAXLEN)
> -			goto err_str;
> +			goto err_sm;
> +
> +		sm = kzalloc(sizeof(*sm), GFP_KERNEL);
> +		if (sm == NULL)
> +			goto err_sm;
>  
>  		tplg->pos += (sizeof(struct snd_soc_tplg_mixer_control)
> +
>  			      le32_to_cpu(mc->priv.size));
> @@ -1327,7 +1328,7 @@ static struct snd_kcontrol_new
> *soc_tplg_dapm_widget_dmixer_create(
>  
>  		kc[i].name = kstrdup(mc->hdr.name, GFP_KERNEL);
>  		if (kc[i].name == NULL)
> -			goto err_str;
> +			goto err_sm;
>  		kc[i].private_value = (long)sm;
>  		kc[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER;
>  		kc[i].access = mc->hdr.access;
> @@ -1353,8 +1354,7 @@ static struct snd_kcontrol_new
> *soc_tplg_dapm_widget_dmixer_create(
>  		err = soc_tplg_kcontrol_bind_io(&mc->hdr, &kc[i],
> tplg);
>  		if (err) {
>  			soc_control_err(tplg, &mc->hdr, mc->hdr.name);
> -			kfree(sm);
> -			continue;
> +			goto err_sm;
>  		}
>  
>  		/* create any TLV data */
> @@ -1367,20 +1367,19 @@ static struct snd_kcontrol_new
> *soc_tplg_dapm_widget_dmixer_create(
>  			dev_err(tplg->dev, "ASoC: failed to init %s\n",
>  				mc->hdr.name);
>  			soc_tplg_free_tlv(tplg, &kc[i]);
> -			kfree(sm);
> -			continue;
> +			goto err_sm;
>  		}
>  	}
>  	return kc;
>  
> -err_str:
> -	kfree(sm);
> -err:
> -	for (--i; i >= 0; i--) {
> -		kfree((void *)kc[i].private_value);
> +err_sm:
> +	for (; i >= 0; i--) {
> +		sm = (struct soc_mixer_control *)kc[i].private_value;
> +		kfree(sm);
>  		kfree(kc[i].name);
>  	}
>  	kfree(kc);
> +
>  	return NULL;
>  }
>  
> @@ -1401,11 +1400,11 @@ static struct snd_kcontrol_new
> *soc_tplg_dapm_widget_denum_create(
>  		/* validate kcontrol */
>  		if (strnlen(ec->hdr.name,
> SNDRV_CTL_ELEM_ID_NAME_MAXLEN) ==
>  			    SNDRV_CTL_ELEM_ID_NAME_MAXLEN)
> -			goto err;
> +			goto err_se;
>  
>  		se = kzalloc(sizeof(*se), GFP_KERNEL);
>  		if (se == NULL)
> -			goto err;
> +			goto err_se;
>  
>  		tplg->pos += (sizeof(struct snd_soc_tplg_enum_control)
> +
>  				ec->priv.size);
> @@ -1414,10 +1413,8 @@ static struct snd_kcontrol_new
> *soc_tplg_dapm_widget_denum_create(
>  			ec->hdr.name);
>  
>  		kc[i].name = kstrdup(ec->hdr.name, GFP_KERNEL);
> -		if (kc[i].name == NULL) {
> -			kfree(se);
> +		if (kc[i].name == NULL)
>  			goto err_se;
> -		}
>  		kc[i].private_value = (long)se;
>  		kc[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER;
>  		kc[i].access = ec->hdr.access;
> @@ -1482,44 +1479,43 @@ static struct snd_kcontrol_new
> *soc_tplg_dapm_widget_denum_create(
>  	for (; i >= 0; i--) {
>  		/* free values and texts */
>  		se = (struct soc_enum *)kc[i].private_value;
> -		if (!se)
> -			continue;
>  
> -		soc_tplg_denum_remove_values(se);
> -		soc_tplg_denum_remove_texts(se);
> +		if (se) {
> +			soc_tplg_denum_remove_values(se);
> +			soc_tplg_denum_remove_texts(se);
> +		}
>  
>  		kfree(se);
>  		kfree(kc[i].name);
>  	}
> -err:
>  	kfree(kc);
>  
>  	return NULL;
>  }
>  
>  static struct snd_kcontrol_new *soc_tplg_dapm_widget_dbytes_create(
> -	struct soc_tplg *tplg, int count)
> +	struct soc_tplg *tplg, int num_kcontrols)
>  {
>  	struct snd_soc_tplg_bytes_control *be;
> -	struct soc_bytes_ext  *sbe;
> +	struct soc_bytes_ext *sbe;
>  	struct snd_kcontrol_new *kc;
>  	int i, err;
>  
> -	kc = kcalloc(count, sizeof(*kc), GFP_KERNEL);
> +	kc = kcalloc(num_kcontrols, sizeof(*kc), GFP_KERNEL);
>  	if (!kc)
>  		return NULL;
>  
> -	for (i = 0; i < count; i++) {
> +	for (i = 0; i < num_kcontrols; i++) {
>  		be = (struct snd_soc_tplg_bytes_control *)tplg->pos;
>  
>  		/* validate kcontrol */
>  		if (strnlen(be->hdr.name,
> SNDRV_CTL_ELEM_ID_NAME_MAXLEN) ==
>  			SNDRV_CTL_ELEM_ID_NAME_MAXLEN)
> -			goto err;
> +			goto err_sbe;
>  
>  		sbe = kzalloc(sizeof(*sbe), GFP_KERNEL);
>  		if (sbe == NULL)
> -			goto err;
> +			goto err_sbe;
>  
>  		tplg->pos += (sizeof(struct snd_soc_tplg_bytes_control)
> +
>  			      le32_to_cpu(be->priv.size));
> @@ -1529,10 +1525,8 @@ static struct snd_kcontrol_new
> *soc_tplg_dapm_widget_dbytes_create(
>  			be->hdr.name, be->hdr.access);
>  
>  		kc[i].name = kstrdup(be->hdr.name, GFP_KERNEL);
> -		if (kc[i].name == NULL) {
> -			kfree(sbe);
> -			goto err;
> -		}
> +		if (kc[i].name == NULL)
> +			goto err_sbe;
>  		kc[i].private_value = (long)sbe;
>  		kc[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER;
>  		kc[i].access = be->hdr.access;
> @@ -1544,8 +1538,7 @@ static struct snd_kcontrol_new
> *soc_tplg_dapm_widget_dbytes_create(
>  		err = soc_tplg_kcontrol_bind_io(&be->hdr, &kc[i],
> tplg);
>  		if (err) {
>  			soc_control_err(tplg, &be->hdr, be->hdr.name);
> -			kfree(sbe);
> -			continue;
> +			goto err_sbe;
>  		}
>  
>  		/* pass control to driver for optional further init */
> @@ -1554,20 +1547,20 @@ static struct snd_kcontrol_new
> *soc_tplg_dapm_widget_dbytes_create(
>  		if (err < 0) {
>  			dev_err(tplg->dev, "ASoC: failed to init %s\n",
>  				be->hdr.name);
> -			kfree(sbe);
> -			continue;
> +			goto err_sbe;
>  		}
>  	}
>  
>  	return kc;
>  
> -err:
> -	for (--i; i >= 0; i--) {
> -		kfree((void *)kc[i].private_value);
> +err_sbe:
> +	for (; i >= 0; i--) {
> +		sbe = (struct soc_bytes_ext *)kc[i].private_value;
> +		kfree(sbe);
>  		kfree(kc[i].name);
>  	}
> -
>  	kfree(kc);
> +
>  	return NULL;
>  }
>