linux-kernel - Re: [PATCH] ALSA: core: Increase the name array size for debugfs directory name

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Date:   Tue, 12 Sep 2023 13:58:10 +0300
From:   Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To:     Takashi Iwai <tiwai@...e.de>, Arnd Bergmann <arnd@...db.de>
Cc:     tiwai@...e.com, Jaroslav Kysela <perex@...ex.cz>,
        Masahiro Yamada <masahiroy@...nel.org>,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH] ALSA: core: Increase the name array size for debugfs
 directory name



On 12/09/2023 13:42, Takashi Iwai wrote:
> On Tue, 12 Sep 2023 12:18:04 +0200,
> Arnd Bergmann wrote:
>>
>> On Tue, Sep 12, 2023, at 10:39, Peter Ujfalusi wrote:
>>
>>> While the code is correct, we need to silence the compiler somehow.
>>> It could be done by limiting the range in sprintf like
>>> sprintf(name, "card%d", idx % SNDRV_CARDS);
>>> sprintf(name, "card%hhd", idx);
>>> etc
>>>
>>> These are too workaroundish. Increase the name array to 15 instead which
>>> looks better and only adds 7 bytes on stack.
>>
>> It looks like we use the same string for kobject_set_name(), so
>> maybe this would work as well:
>>
>> --- a/sound/core/init.c
>> +++ b/sound/core/init.c
>> @@ -278,9 +278,6 @@ static int snd_card_init(struct snd_card *card, struct device *parent,
>>                          size_t extra_size)
>>  {
>>         int err;
>> -#ifdef CONFIG_SND_DEBUG
>> -       char name[8];
>> -#endif
>>  
>>         if (extra_size > 0)
>>                 card->private_data = (char *)card + sizeof(struct snd_card);
>> @@ -364,8 +361,8 @@ static int snd_card_init(struct snd_card *card, struct device *parent,
>>         }
>>  
>>  #ifdef CONFIG_SND_DEBUG
>> -       sprintf(name, "card%d", idx);
>> -       card->debugfs_root = debugfs_create_dir(name, sound_debugfs_root);
>> +       card->debugfs_root = debugfs_create_dir(kobject_name(&card->card_dev.kobj),
>> +                                               sound_debugfs_root);
> 
> The idea looks neat, but I suppose it's better with
> dev_name(&card->card_dev) instead?

Yes, this looks better, I will send a new patch in a minute.

> 
> thanks,
> 
> Takashi

-- 
Péter