Re: [alsa-devel] [PATCH] ASoC: DAPM: Fix build warning

[Takashi Iwai]

At Wed, 25 Mar 2015 10:13:28 +0000,
Charles Keepax wrote:
> 
> commit c66150824b8a ("ASoC: dapm: add code to configure dai link
> parameters") introduced the following build warning:
> 
> sound/soc/soc-dapm.c: In function 'snd_soc_dapm_new_pcm':
> sound/soc/soc-dapm.c:3389:4: warning: passing argument 1 of 'snprintf'
> discards 'const' qualifier from pointer target type
>     snprintf(w_param_text[count], len,
> 
> This patch fixes this by adding a non-const temporary variable to hold
> the value as it is created before assigning to the entry in
> w_param_text.
> 
> Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx>

An easier fix would be to replace with devm_kasprintf().  Then you can
do it all in a single line.

	w_param_text[count] = devm_kasprintf(card->dev, GFP_KERNEL,
				"Anonymous Configuration %d", count);


Takashi

> ---
>  sound/soc/soc-dapm.c |   10 ++++++----
>  1 files changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
> index 049b300..7640370 100644
> --- a/sound/soc/soc-dapm.c
> +++ b/sound/soc/soc-dapm.c
> @@ -3376,18 +3376,20 @@ int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
>  
>  	for (count = 0 ; count < num_params; count++) {
>  		if (!config->stream_name) {
> +			char *anon_name;
> +
>  			dev_warn(card->dapm.dev,
>  				"ASoC: anonymous config %d for dai link %s\n",
>  				count, link_name);
>  			len = strlen("Anonymous Configuration ") + 3;
> -			w_param_text[count] =
> -				devm_kzalloc(card->dev, len, GFP_KERNEL);
> -			if (!w_param_text[count]) {
> +			anon_name = devm_kzalloc(card->dev, len, GFP_KERNEL);
> +			if (!anon_name) {
>  				ret = -ENOMEM;
>  				goto outfree_link_name;
>  			}
> -			snprintf(w_param_text[count], len,
> +			snprintf(anon_name, len,
>  				"Anonymous Configuration %d", count);
> +			w_param_text[count] = anon_name;
>  		} else {
>  			w_param_text[count] = devm_kmemdup(card->dev,
>  						config->stream_name,
> -- 
> 1.7.2.5
> 
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> 
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