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ASoC: mediatek: common: handle NULL case in suspend/resume function

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When memory allocation for afe->reg_back_up fails, reg_back_up can't
be used.
Keep the suspend/resume flow but skip register backup when
afe->reg_back_up is NULL, in case illegal memory access happens.

Fixes: 283b612429 ("ASoC: mediatek: implement mediatek common structure")
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210910092613.30188-1-trevor.wu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Trevor Wu 2021-09-10 17:26:13 +08:00 committed by Mark Brown
parent 26be23af18
commit 1dd0385226
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 11 additions and 8 deletions
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19
sound/soc/mediatek/common/mtk-afe-fe-dai.c
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@ -334,9 +334,11 @@ int mtk_afe_suspend(struct snd_soc_component *component)
devm_kcalloc(dev, afe->reg_back_up_list_num,
sizeof(unsigned int), GFP_KERNEL);
for (i = 0; i < afe->reg_back_up_list_num; i++)
regmap_read(regmap, afe->reg_back_up_list[i],
&afe->reg_back_up[i]);
if (afe->reg_back_up) {
for (i = 0; i < afe->reg_back_up_list_num; i++)
regmap_read(regmap, afe->reg_back_up_list[i],
&afe->reg_back_up[i]);
}
afe->suspended = true;
afe->runtime_suspend(dev);
@ -356,12 +358,13 @@ int mtk_afe_resume(struct snd_soc_component *component)
afe->runtime_resume(dev);
if (!afe->reg_back_up)
if (!afe->reg_back_up) {
dev_dbg(dev, "%s no reg_backup\n", __func__);
for (i = 0; i < afe->reg_back_up_list_num; i++)
mtk_regmap_write(regmap, afe->reg_back_up_list[i],
afe->reg_back_up[i]);
} else {
for (i = 0; i < afe->reg_back_up_list_num; i++)
mtk_regmap_write(regmap, afe->reg_back_up_list[i],
afe->reg_back_up[i]);
}
afe->suspended = false;
return 0;