linux-kernel - Re: [RFC PATCH 31/40] soundwire: intel: move shutdown() callback and don't export symbol

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Date:   Fri, 26 Jul 2019 12:38:10 +0200
From:   Cezary Rojewski <cezary.rojewski@...el.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, vkoul@...nel.org,
        gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, slawomir.blauciak@...el.com,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [RFC PATCH 31/40] soundwire: intel: move shutdown() callback and
 don't export symbol

On 2019-07-26 01:40, Pierre-Louis Bossart wrote:
> +void intel_shutdown(struct snd_pcm_substream *substream,
> +		    struct snd_soc_dai *dai)
> +{
> +	struct sdw_cdns_dma_data *dma;
> +
> +	dma = snd_soc_dai_get_dma_data(dai, substream);
> +	if (!dma)
> +		return;
> +
> +	snd_soc_dai_set_dma_data(dai, substream, NULL);
> +	kfree(dma);
> +}

Correct me if I'm wrong, but do we really need to _get_dma_ here?
_set_dma_ seems bulletproof, same for kfree.