[bug report] ASoC: mediatek: implement mediatek common structure

[Trevor Wu]

Hi Dan,

Garlic has left mediatek, so I will help this problem.
Thank you for pointing out the problem.
It seems that some handling for NULL case should be added to
suspend/resume funtion.
I will send a patch for the problem.

Thanks,
Trevor


On Fri, 2021-08-27 at 11:57 +0300, Dan Carpenter wrote:
> Hello Garlic Tseng,
> 
> The patch 283b612429a2: "ASoC: mediatek: implement mediatek common
> structure" from Jun 17, 2016, leads to the following
> Smatch static checker warning:
> 
> 	sound/soc/mediatek/common/mtk-afe-fe-dai.c:364 mtk_afe_resume()
> 	error: we previously assumed 'afe->reg_back_up' could be null
> (see line 359)
> 
> sound/soc/mediatek/common/mtk-afe-fe-dai.c
>     354         if (pm_runtime_status_suspended(dev) || !afe-
> >suspended)
>     355                 return 0;
>     356 
>     357         afe->runtime_resume(dev);
>     358 
>     359         if (!afe->reg_back_up)
>     360                 dev_dbg(dev, "%s no reg_backup\n", __func__);
> 
> Should this return?  Also when ->reg_back_up is allocated there is no
> check for NULL so it seems like a very possible condition.
> 
>     361 
>     362         for (i = 0; i < afe->reg_back_up_list_num; i++)
>     363                 mtk_regmap_write(regmap, afe-
> >reg_back_up_list[i],
> --> 364                                  afe->reg_back_up[i]);
>     365 
>     366         afe->suspended = false;
>     367         return 0;
>     368 }
> 
> regards,
> dan carpenter
> 
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