linux-kernel - [PATCH] ASoC: img-spdif-out: Fix runtime PM imbalance on error

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Message-Id: <20200527084610.4790-1-dinghao.liu@zju.edu.cn>
Date:   Wed, 27 May 2020 16:46:08 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: img-spdif-out: Fix runtime PM imbalance on error

pm_runtime_get_sync() increments the runtime PM usage counter even
the call returns an error code. Thus a pairing decrement is needed
on the error handling path to keep the counter balanced.

Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---
 sound/soc/img/img-spdif-out.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/soc/img/img-spdif-out.c b/sound/soc/img/img-spdif-out.c
index 456c462d52fb..b1d8e4535726 100644
--- a/sound/soc/img/img-spdif-out.c
+++ b/sound/soc/img/img-spdif-out.c
@@ -370,8 +370,10 @@ static int img_spdif_out_probe(struct platform_device *pdev)
 			goto err_pm_disable;
 	}
 	ret = pm_runtime_get_sync(&pdev->dev);
-	if (ret < 0)
+	if (ret < 0) {
+		pm_runtime_put_noidle(&pdev->dev);
 		goto err_suspend;
+	}
 
 	img_spdif_out_writel(spdif, IMG_SPDIF_OUT_CTL_FS_MASK,
 			     IMG_SPDIF_OUT_CTL);
-- 
2.17.1