[PATCH] ASoC: codecs: lpass-tx-macro: Check for error pointer after calling devm_regmap_init_mmio

[Jiasheng Jiang]

The devm_regmap_init_mmio() may return error pointer under certain
circumstances, for example the possible failure of the kzalloc() in
regmap_mmio_gen_context(), which is called by devm_regmap_init_mmio().
Then the tx->regmap will be error pointer and be used in
tx_macro_mclk_enable().
Therefore, it should be better to check it in order to avoid the
dereference of the error pointer.

Fixes: c39667ddcfc5 ("ASoC: codecs: lpass-tx-macro: add support for lpass tx macro")
Signed-off-by: Jiasheng Jiang <jiasheng at iscas.ac.cn>
---
 sound/soc/codecs/lpass-tx-macro.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/codecs/lpass-tx-macro.c b/sound/soc/codecs/lpass-tx-macro.c
index 27a0d5defd27..e4bbc6bd4925 100644
--- a/sound/soc/codecs/lpass-tx-macro.c
+++ b/sound/soc/codecs/lpass-tx-macro.c
@@ -1803,6 +1803,8 @@ static int tx_macro_probe(struct platform_device *pdev)
 		return PTR_ERR(base);
 
 	tx->regmap = devm_regmap_init_mmio(dev, base, &tx_regmap_config);
+	if (IS_ERR(tx->regmap))
+		return PTR_ERR(tx->regmap);
 
 	dev_set_drvdata(dev, tx);
 
-- 
2.25.1