[alsa-devel] [PATCH 14/31] ASoC: dmaengine: support deferred probe for DMA channels

[Lars-Peter Clausen]

On 11/15/2013 09:54 PM, Stephen Warren wrote:
>  
> @@ -315,6 +343,7 @@ int snd_dmaengine_pcm_register(struct device *dev,
>  	const struct snd_dmaengine_pcm_config *config, unsigned int flags)
>  {
>  	struct dmaengine_pcm *pcm;
> +	int ret;
>  
>  	pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
>  	if (!pcm)
> @@ -323,14 +352,26 @@ int snd_dmaengine_pcm_register(struct device *dev,
>  	pcm->config = config;
>  	pcm->flags = flags;
>  
> -	dmaengine_pcm_request_chan_of(pcm, dev);
> +	ret = dmaengine_pcm_request_chan_of(pcm, dev);
> +	if (ret)
> +		goto err_free_pcm;
>  

We should still call dmaengine_pcm_release_chan() in case requesting the
first channel succeeded, but the second did not.

>  	if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
> -		return snd_soc_add_platform(dev, &pcm->platform,
> +		ret = snd_soc_add_platform(dev, &pcm->platform,
>  				&dmaengine_no_residue_pcm_platform);
>  	else
> -		return snd_soc_add_platform(dev, &pcm->platform,
> +		ret = snd_soc_add_platform(dev, &pcm->platform,
>  				&dmaengine_pcm_platform);
> +	if (ret)
> +		goto err_free_dma;
> +
> +	return 0;
> +
> +err_free_dma:
> +	dmaengine_pcm_release_chan(pcm);
> +err_free_pcm:
> +	kfree(pcm);
> +	return ret;
>  }
>  EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_register);
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