[PATCH] ASoC: pxa2xx-ac97: fix oops when codec_driver probe runs

[broonie@opensource.wolfsonmicro.com (Mark Brown)]

On Fri, Dec 28, 2012 at 06:17:55AM -0800, Mike Dunn wrote:

> -	/* Punt most of the init to the SoC probe; we may need the machine
> -	 * driver to do interesting things with the clocking to get us up
> -	 * and running.
> -	 */
> -	return snd_soc_register_dais(&pdev->dev, pxa_ac97_dai_driver,
> -			ARRAY_SIZE(pxa_ac97_dai_driver));
> +	ret = snd_soc_register_dais(&pdev->dev, pxa_ac97_dai_driver,
> +				    ARRAY_SIZE(pxa_ac97_dai_driver));
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "snd_soc_register_dais failed with %d\n",
> +			ret);
> +		return ret;
> +	}
> +
> +	ret = pxa2xx_ac97_hw_probe(pdev);
> +	if (ret < 0) {
> +		dev_err(&pdev->dev, "pxa2xx_ac97_hw_probe failed with %d\n",
> +			ret);
> +		snd_soc_unregister_dais(&pdev->dev,
> +					ARRAY_SIZE(pxa_ac97_dai_driver));
> +	}
> +	return ret;

We should be doing all resource acquisition before registering the DAIs,
if anything this patch introduces the potential for additional issues
with the clocks not having been acquired before we try to use them in
the sound card.
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