Re: [PATCH] ASoC: don't call of_dma_request_slave_channel directly

[Shawn Guo]

On Tue, Apr 23, 2013 at 05:54:33PM +0200, Arnd Bergmann wrote:
> The exported interface for device drivers is dma_request_slave_channel,
> not of_dma_request_slave_channel. The former does not depend on device
> tree but also works with ACPI and other interfaces providing an
> abstraction for DMA channels.
> 
> This fixes link errors when building ALSA as a loadable module.
> 
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

I had already sent a similar patch [1] for that.

Shawn

[1] http://thread.gmane.org/gmane.linux.alsa.devel/107568/

> Cc: alsa-devel@xxxxxxxxxxxxxxxx
> Cc: Lars-Peter Clausen <lars@xxxxxxxxxx>
> Cc: Shawn Guo <shawn.guo@xxxxxxxxxx>
> Cc: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> ---
>  sound/soc/soc-generic-dmaengine-pcm.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/sound/soc/soc-generic-dmaengine-pcm.c b/sound/soc/soc-generic-dmaengine-pcm.c
> index 5fd5ed4..8ee9859 100644
> --- a/sound/soc/soc-generic-dmaengine-pcm.c
> +++ b/sound/soc/soc-generic-dmaengine-pcm.c
> @@ -219,19 +219,20 @@ static const char * const dmaengine_pcm_dma_channel_names[] = {
>  };
>  
>  static void dmaengine_pcm_request_chan_of(struct dmaengine_pcm *pcm,
> -	struct device_node *of_node)
> +	struct device *dev)
>  {
>  	unsigned int i;
> +	struct device_node *of_node = dev->of_node;
>  
>  	if ((pcm->flags & SND_DMAENGINE_PCM_FLAG_NO_DT) || !of_node)
>  		return;
>  
>  	if (pcm->flags & SND_DMAENGINE_PCM_FLAG_HALF_DUPLEX) {
> -		pcm->chan[0] = of_dma_request_slave_channel(of_node, "tx_rx");
> +		pcm->chan[0] = dma_request_slave_channel(dev, "tx_rx");
>  		pcm->chan[1] = pcm->chan[0];
>  	} else {
>  		for (i = SNDRV_PCM_STREAM_PLAYBACK; i <= SNDRV_PCM_STREAM_CAPTURE; i++) {
> -			pcm->chan[i] = of_dma_request_slave_channel(of_node,
> +			pcm->chan[i] = dma_request_slave_channel(dev,
>  					dmaengine_pcm_dma_channel_names[i]);
>  		}
>  	}
> @@ -255,7 +256,7 @@ int snd_dmaengine_pcm_register(struct device *dev,
>  	pcm->config = config;
>  	pcm->flags = flags;
>  
> -	dmaengine_pcm_request_chan_of(pcm, dev->of_node);
> +	dmaengine_pcm_request_chan_of(pcm, dev);
>  
>  	if (flags & SND_DMAENGINE_PCM_FLAG_NO_RESIDUE)
>  		return snd_soc_add_platform(dev, &pcm->platform,
> -- 
> 1.8.1.2
> 

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