linux-kernel - Re: [PATCH v2 1/2] ASoC: simple-card-utils: Split simple_fixup_sample

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Date: Thu, 30 May 2024 13:02:59 +0200
From: "Thierry Reding" <thierry.reding@...il.com>
To: "Sameer Pujar" <spujar@...dia.com>, <broonie@...nel.org>,
 <linux-sound@...r.kernel.org>, <alsa-devel@...a-project.org>
Cc: <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <lgirdwood@...il.com>, <jonathanh@...dia.com>, <mkumard@...dia.com>
Subject: Re: [PATCH v2 1/2] ASoC: simple-card-utils: Split
 simple_fixup_sample_fmt func

On Mon May 27, 2024 at 2:56 PM CEST, Sameer Pujar wrote:
> From: Mohan Kumar <mkumard@...dia.com>
>
> Split the simple_fixup_sample_fmt() into two functions by adding
> one more function named simple_util_get_sample_fmt() to return
> the sample format value.
>
> This is useful for drivers that wish to simply get the sample format
> without setting the mask.
>
> Signed-off-by: Mohan Kumar <mkumard@...dia.com>
> Signed-off-by: Sameer Pujar <spujar@...dia.com>
> ---
>  include/sound/simple_card_utils.h     |  2 ++
>  sound/soc/generic/simple-card-utils.c | 26 ++++++++++++++++++++------
>  2 files changed, 22 insertions(+), 6 deletions(-)
>
> diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
> index ad67957b7b48..2c2279d082ec 100644
> --- a/include/sound/simple_card_utils.h
> +++ b/include/sound/simple_card_utils.h
> @@ -174,6 +174,8 @@ void simple_util_parse_convert(struct device_node *np, char *prefix,
>  			       struct simple_util_data *data);
>  bool simple_util_is_convert_required(const struct simple_util_data *data);
>  
> +int simple_util_get_sample_fmt(struct simple_util_data *data);
> +
>  int simple_util_parse_routing(struct snd_soc_card *card,
>  				      char *prefix);
>  int simple_util_parse_widgets(struct snd_soc_card *card,
> diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
> index 81077d16d22f..f1f5a1c025fc 100644
> --- a/sound/soc/generic/simple-card-utils.c
> +++ b/sound/soc/generic/simple-card-utils.c
> @@ -13,12 +13,11 @@
>  #include <sound/pcm_params.h>
>  #include <sound/simple_card_utils.h>
>  
> -static void simple_fixup_sample_fmt(struct simple_util_data *data,
> -					 struct snd_pcm_hw_params *params)
> +int simple_util_get_sample_fmt(struct simple_util_data *data)
>  {
>  	int i;
> -	struct snd_mask *mask = hw_param_mask(params,
> -					      SNDRV_PCM_HW_PARAM_FORMAT);
> +	int val = -EINVAL;
> +
>  	struct {
>  		char *fmt;
>  		u32 val;
> @@ -33,11 +32,26 @@ static void simple_fixup_sample_fmt(struct simple_util_data *data,
>  	for (i = 0; i < ARRAY_SIZE(of_sample_fmt_table); i++) {
>  		if (!strcmp(data->convert_sample_format,
>  			    of_sample_fmt_table[i].fmt)) {
> -			snd_mask_none(mask);
> -			snd_mask_set(mask, of_sample_fmt_table[i].val);
> +			val = of_sample_fmt_table[i].val;
>  			break;
>  		}
>  	}
> +	return val;
> +}
> +EXPORT_SYMBOL_GPL(simple_util_get_sample_fmt);
> +
> +static void simple_fixup_sample_fmt(struct simple_util_data *data,
> +				    struct snd_pcm_hw_params *params)
> +{
> +	int val;
> +	struct snd_mask *mask = hw_param_mask(params,
> +					      SNDRV_PCM_HW_PARAM_FORMAT);
> +
> +	val = simple_util_get_sample_fmt(data);
> +	if (val >= 0) {

Maybe nothing that we need to worry about, but this could be potentially
a problem if the snd_pcm_format_t ever outgrows the non-negative number
space. snd_pcm_format_t is defined to be an int as well, so any very
large number would wrap into a negative value and then would be
considered an error in this check.

Then again, if that ever were to happen, we'd likely get a compiler
error for the snd_pcm_format_t overflowing, so we'd probably notice and
rewrite at that point.

So I suppose:

Reviewed-by: Thierry Reding <treding@...dia.com>

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