linux-kernel - [PATCH -next] ASoC: mediatek: mt2701: fix return value check in mt2701_afe_pcm_dev

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Date:   Mon, 8 Jan 2018 02:15:01 +0000
From:   Wei Yongjun <weiyongjun1@...wei.com>
To:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        "Garlic Tseng" <garlic.tseng@...iatek.com>,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
CC:     Wei Yongjun <weiyongjun1@...wei.com>,
        <alsa-devel@...a-project.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH -next] ASoC: mediatek: mt2701: fix return value check in mt2701_afe_pcm_dev_probe()

In case of error, the function syscon_node_to_regmap() returns ERR_PTR()
and never returns NULL. The NULL test in the return value check should
be replaced with IS_ERR().

Fixes: dfa3cbb83e09 ("ASoC: mediatek: modify MT2701 AFE driver to adapt mfd device")
Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>
---
 sound/soc/mediatek/mt2701/mt2701-afe-pcm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/mediatek/mt2701/mt2701-afe-pcm.c b/sound/soc/mediatek/mt2701/mt2701-afe-pcm.c
index f0cd08f..5bc4e00 100644
--- a/sound/soc/mediatek/mt2701/mt2701-afe-pcm.c
+++ b/sound/soc/mediatek/mt2701/mt2701-afe-pcm.c
@@ -1440,9 +1440,9 @@ static int mt2701_afe_pcm_dev_probe(struct platform_device *pdev)
 	}
 
 	afe->regmap = syscon_node_to_regmap(dev->parent->of_node);
-	if (!afe->regmap) {
+	if (IS_ERR(afe->regmap)) {
 		dev_err(dev, "could not get regmap from parent\n");
-		return -ENODEV;
+		return PTR_ERR(afe->regmap);
 	}
 
 	mutex_init(&afe->irq_alloc_lock);