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);