linux-kernel - Re: [PATCH v2 1/1] ASoC: Intel: catpt: remove duplicating driver data retrieval

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Date:   Mon, 4 Jul 2022 10:36:33 +0300
From:   Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Cc:     Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Subject: Re: [PATCH v2 1/1] ASoC: Intel: catpt: remove duplicating driver data
 retrieval



On 03/07/2022 17:51, Andy Shevchenko wrote:
> device_get_match_data() in ACPI case calls similar to acpi_match_device().
> Hence there is no need to duplicate the call. Just assign what is in
> the id->driver_data.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> v2: dropped device_get_match_data() and rewrote commit message
>  sound/soc/intel/catpt/device.c | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/sound/soc/intel/catpt/device.c b/sound/soc/intel/catpt/device.c
> index 85a34e37316d..2eeaeb962532 100644
> --- a/sound/soc/intel/catpt/device.c
> +++ b/sound/soc/intel/catpt/device.c
> @@ -247,6 +247,7 @@ static int catpt_acpi_probe(struct platform_device *pdev)
>  	id = acpi_match_device(dev->driver->acpi_match_table, dev);
>  	if (!id)
>  		return -ENODEV;
> +	spec = (const struct catpt_spec *)id->driver_data;
>  
>  	ret = snd_intel_acpi_dsp_driver_probe(dev, id->id);
>  	if (ret != SND_INTEL_DSP_DRIVER_ANY && ret != SND_INTEL_DSP_DRIVER_SST) {
> @@ -254,10 +255,6 @@ static int catpt_acpi_probe(struct platform_device *pdev)
>  		return -ENODEV;
>  	}
>  
> -	spec = device_get_match_data(dev);
> -	if (!spec)
> -		return -ENODEV;
> -
>  	cdev = devm_kzalloc(dev, sizeof(*cdev), GFP_KERNEL);
>  	if (!cdev)
>  		return -ENOMEM;

We could just pass the "(const struct catpt_spec *)id->driver_data" in
place of spec to catpt_dev_init() and we can get rid of the local
temporary pointer?

If not, then I would cast out the spec before it's use:
spec = (const struct catpt_spec *)id->driver_data;
catpt_dev_init(cdev, dev, spec);

-- 
Péter