Re: [PATCH 13/31] ASoC: wm_adsp: Fix BUG_ON() and WARN_ON() usages

[Charles Keepax <ckeepax@opensource.wolfsonmicro.com>]

On Tue, Nov 05, 2013 at 06:40:00PM +0100, Takashi Iwai wrote:
> @@ -645,27 +647,22 @@ static int wm_adsp_load(struct wm_adsp *dsp)
>  			reg = offset;
>  			break;
>  		case WMFW_ADSP1_PM:
> -			BUG_ON(!mem);
>  			region_name = "PM";
>  			reg = wm_adsp_region_to_reg(mem, offset);
>  			break;
>  		case WMFW_ADSP1_DM:
> -			BUG_ON(!mem);
>  			region_name = "DM";
>  			reg = wm_adsp_region_to_reg(mem, offset);
>  			break;
>  		case WMFW_ADSP2_XM:
> -			BUG_ON(!mem);
>  			region_name = "XM";
>  			reg = wm_adsp_region_to_reg(mem, offset);
>  			break;
>  		case WMFW_ADSP2_YM:
> -			BUG_ON(!mem);
>  			region_name = "YM";
>  			reg = wm_adsp_region_to_reg(mem, offset);
>  			break;
>  		case WMFW_ADSP1_ZM:
> -			BUG_ON(!mem);
>  			region_name = "ZM";
>  			reg = wm_adsp_region_to_reg(mem, offset);
>  			break;

These do make me a little nervous previously we would panic here,
so everything would stop but now we may write random registers on
the CODEC which could cause some odd behaviour. I think it would
be better to update wm_adsp_region_to_reg to allow a failed
return code and then error out of wm_adsp_load rather than just
relying on the WARN_ON inside.

Otherwise the patch looks good to me though.

Thanks,
Charles