linux-kernel - Re: [PATCH v3 01/13] ASoC: soc-core: Fix component name

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Date:   Fri, 2 Oct 2020 14:20:47 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
CC:     <broonie@...nel.org>, <lgirdwood@...il.com>, <robh+dt@...nel.org>,
        <kuninori.morimoto.gx@...esas.com>,
        <pierre-louis.bossart@...ux.intel.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <alsa-devel@...a-project.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <sharadg@...dia.com>,
        <mkumard@...dia.com>, <viswanathl@...dia.com>,
        <rlokhande@...dia.com>, <dramesh@...dia.com>,
        <atalambedu@...dia.com>, <nwartikar@...dia.com>,
        <swarren@...dia.com>, <nicoleotsuka@...il.com>
Subject: Re: [PATCH v3 01/13] ASoC: soc-core: Fix component name_prefix
 parsing


>> The "prefix" can be defined in DAI link node or it can be specified as
>> part of the component node itself. Currently "sound-name-prefix" defined
>> in a component is not taking effect. Actually the property is not getting
>> parsed. It can be fixed by parsing "sound-name-prefix" property whenever
>> "prefix" is missing in DAI link Codec node.
> [...]
>> --- a/sound/soc/soc-core.c
>> +++ b/sound/soc/soc-core.c
>> @@ -1124,7 +1124,8 @@ static void soc_set_name_prefix(struct snd_soc_card *card,
>>        for (i = 0; i < card->num_configs; i++) {
>>                struct snd_soc_codec_conf *map = &card->codec_conf[i];
>>
>> -             if (snd_soc_is_matching_component(&map->dlc, component)) {
>> +             if (snd_soc_is_matching_component(&map->dlc, component) &&
>> +                 map->name_prefix) {
>>                        component->name_prefix = map->name_prefix;
>>                        return;
>>                }
> Hi,
>
> It is not obvious how the patch fixes the problem described. I guess now
> map->name_prefix is NULL on some level and overrides prefix found earlier?
>
> Best Regards,
> Michał Mirosław

If map->name_prefix is NULL (which is the prefix defined for Codec DAI 
component in a DAI link), then go ahead and check if "sound-name-prefix" 
is provided under component device node itself.