Re: [PATCH v21 33/39] ASoC: usb: Fetch ASoC sound card information

[Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>]

> +/**
> + * snd_soc_usb_device_offload_available() - Fetch BE DAI link sound card
> + * @dev: the device to find in SOC USB
> + *
> + * Finds the component linked to a specific SOC USB instance, and returns
> + * the sound card number for the platform card supporting offloading.
> + *
> + */
> +int snd_soc_usb_device_offload_available(struct device *dev)
> +{
> +	struct snd_soc_usb *ctx;
> +
> +	ctx = snd_soc_find_usb_ctx(dev);
> +	if (!ctx)
> +		return -ENODEV;
> +
> +	return ctx->component->card->snd_card->number;
> +}

Presumably there's a notification to help applications discard this
information on removal?