ASoC: mediatek: implement mediatek common structure

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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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

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