linux-kernel - Re: [alsa-devel] [PATCH] ASoC: dmaengine: Add config parameter NULL check.

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Date:	Tue, 17 Dec 2013 08:12:17 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Xiubo Li <Li.Xiubo@...escale.com>
CC:	lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
	tiwai@...e.de, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [PATCH] ASoC: dmaengine: Add config parameter NULL
 check.

On 12/17/2013 08:16 AM, Xiubo Li wrote:
> Because the "ASoC: dmaengine-pcm: Provide default config" has provided
> us one defualt config of DMA. When using this, the config parameter of
> devm_snd_dmaengine_pcm_register() will be NULL, so here we need to have
> a check before using it.
> 
> Signed-off-by: Xiubo Li <Li.Xiubo@...escale.com>

Acked-by: Lars-Peter Clausen <lars@...afoo.de>

Thanks.

> ---
>  sound/soc/soc-generic-dmaengine-pcm.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
> index 7483922..2a6c569 100644
> --- a/sound/soc/soc-generic-dmaengine-pcm.c
> +++ b/sound/soc/soc-generic-dmaengine-pcm.c
> @@ -299,7 +299,7 @@ static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
>  	    !dev->of_node)
>  		return 0;
>  
> -	if (config->dma_dev) {
> +	if (config && config->dma_dev) {
>  		/*
>  		 * If this warning is seen, it probably means that your Linux
>  		 * device structure does not match your HW device structure.
> @@ -317,7 +317,7 @@ static int dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
>  			name = "rx-tx";
>  		else
>  			name = dmaengine_pcm_dma_channel_names[i];
> -		if (config->chan_names[i])
> +		if (config && config->chan_names[i])
>  			name = config->chan_names[i];
>  		chan = dma_request_slave_channel_reason(dev, name);
>  		if (IS_ERR(chan)) {
> 

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