linux-kernel - Re: [RFC PATCH v2 07/22] ASoC: Add SOC USB APIs for adding an USB backend

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Date:   Sun, 29 Jan 2023 14:54:43 +0800
From:   Zhou Furong <furong.zhou@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>
Cc:     srinivas.kandagatla@...aro.org, mathias.nyman@...el.com,
        perex@...ex.cz, lgirdwood@...il.com, andersson@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, Thinh.Nguyen@...opsys.com,
        broonie@...nel.org, bgoswami@...cinc.com, tiwai@...e.com,
        robh+dt@...nel.org, agross@...nel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-usb@...r.kernel.org, quic_jackp@...cinc.com,
        quic_plai@...cinc.com
Subject: Re: [RFC PATCH v2 07/22] ASoC: Add SOC USB APIs for adding an USB
 backend



>> +void *snd_soc_usb_get_priv_data(struct device *usbdev)
>> +{
>> +	struct snd_soc_usb *ctx;
>> +
>> +	if (!usbdev)
>> +		return NULL;
> 
> How could usbdev ever be NULL?
The method is exported to public, valid check should be reasonable
as someone may call it by mistake

> 
>> +
>> +	ctx = snd_soc_find_usb_ctx(usbdev);
>> +
>> +	return ctx ? ctx->priv_data : NULL;
>> +}
>> +EXPORT_SYMBOL_GPL(snd_soc_usb_get_priv_data);
>> +