[alsa-devel] i.MX SDMA support

[Liam Girdwood]

On Wed, 2010-08-11 at 10:44 +0200, Sascha Hauer wrote:
> On Tue, Aug 10, 2010 at 03:07:43PM +0100, Liam Girdwood wrote:
> > On Tue, 2010-08-10 at 15:15 +0200, Sascha Hauer wrote:
> > 
> > > I just looked at the i.MX part in the multi-component update and this
> > > is currently far from being in a working state, so there's still some
> > > work to do before thinking about possible conflicts...
> > 
> > Ok, I don't think it's that far off. Everything builds for i.MX and all
> > components should register. The part I can't test is the component
> > probe() and playback/capture.
> > 
> > Have you seen an oops ?
> > 
> 
> Besides the patch that I just sent I get a null pointer deref without
> the following patch. I couldn't find who should set
> codec->ac97->bus->card, but it's null when I get here. Is this an i.MX
> fault or is there something else missing here?
> 

That is set in the AC97 core and did work at the time of the RFC (when I
could test on my now non working Zylonite). Although since the RFC there
had been changes to use the dev_name for component binding and a little
re-reordering on the bind (and would have affected this piece of code
too). 

> Sascha
> 
> diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
> index 81a77e0..eddb26e 100644
> --- a/sound/soc/soc-core.c
> +++ b/sound/soc/soc-core.c
> @@ -312,7 +312,7 @@ static int soc_ac97_dev_register(struct snd_soc_codec *codec)
>  	codec->ac97->dev.release = soc_ac97_device_release;
>  
>  	dev_set_name(&codec->ac97->dev, "%d-%d:%s",
> -		     codec->ac97->bus->card->number, 0, codec->name);
> +		     codec->snd_card->number, 0, codec->name);
>  	err = device_register(&codec->ac97->dev);
>  	if (err < 0) {
>  		snd_printk(KERN_ERR "Can't register ac97 bus\n");

This looks good to me, as card will be set after the device_register.

Thanks

Liam

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