[alsa-devel] [PATCH] ASoC: Intel: Fix the driver data not set issue

[Liam Girdwood]

On Tue, 2014-11-04 at 14:45 +0800, Jie Yang wrote:
> The priv_data is allocated again here wrongly, and it
> is not set to the driver data after assignment. This
> make the pdata->dev is NULL and oops occurs on the first
> call to hsw_volume_put.
> 
> The resource has been allocated in driver probe callback
> hsw_pcm_dev_probe, so here just remove this sencond
> allocation is OK.
> 
> Signed-off-by: Jie Yang <yang.jie at intel.com>
> ---
>  sound/soc/intel/sst-haswell-pcm.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/sound/soc/intel/sst-haswell-pcm.c b/sound/soc/intel/sst-haswell-pcm.c
> index 21f1316..bc02a6e 100644
> --- a/sound/soc/intel/sst-haswell-pcm.c
> +++ b/sound/soc/intel/sst-haswell-pcm.c
> @@ -866,7 +866,6 @@ static int hsw_pcm_probe(struct snd_soc_platform *platform)
>  	dev = platform->dev;
>  	dma_dev = pdata->dma_dev;
>  
> -	priv_data = devm_kzalloc(platform->dev, sizeof(*priv_data), GFP_KERNEL);
>  	priv_data->hsw = pdata->dsp;
>  	priv_data->dev = platform->dev;
>  	priv_data->pm_state = HSW_PM_STATE_D0;

Keyon, I've just updated git and it looks like this patch is probably
missing some parts :-

  CC [M]  sound/soc/intel/haswell.o
sound/soc/intel/sst-haswell-pcm.c: In function ‘hsw_pcm_probe’:
sound/soc/intel/sst-haswell-pcm.c:870:17: warning: ‘priv_data’ may be used uninitialized in this function [-Wmaybe-uninitialized]
  priv_data->hsw = pdata->dsp;
                 ^

Can you fix this and re-test.

Thanks

Liam