Re: [alsa-devel] [PATCH V2 REPOST] ASoC: dmaengine: support deferred probe for DMA channels

On 12/10/2013 11:06 AM, Lars-Peter Clausen wrote:

On 12/10/2013 06:59 PM, Stephen Warren wrote:

...

From: Stephen Warren swarren@nvidia.com

Enhance dmaengine_pcm_request_chan_of() to support deferred probe for DMA channels, by using the new dma_request_slave_channel_or_err() API. This prevents snd_dmaengine_pcm_register() from succeeding without acquiring DMA channels due to the relevant DMA controller not yet being registered.

Signed-off-by: Stephen Warren swarren@nvidia.com Acked-by: Lars-Peter Clausen lars@metafoo.de

Still looks good, but one nitpick:

...

• pcm->chan[i] = dma_request_slave_channel(dev, name);
  

• chan = dma_request_slave_channel_reason(dev, name);
  

• if (IS_ERR(chan)) {
  

• 	if (PTR_ERR(pcm->chan[i]) == -EPROBE_DEFER)
  

• 		return -EPROBE_DEFER;
  

• 	pcm->chan[i] = NULL;
  

• } else
  

• 	pcm->chan[i] = chan;
  

I think checkpatch will complain about the above. There should be brackets around the else branch.

Hmm. It doesn't complain for some reason, but I'll fix that and repost.