linux-kernel - [PATCH] [v2] hwrng: ks-sa - Fix runtime PM imbalance on error

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Message-Id: <20200528072106.5191-1-dinghao.liu@zju.edu.cn>
Date:   Thu, 28 May 2020 15:21:04 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn, kjlu@....edu
Cc:     Matt Mackall <mpm@...enic.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ben Dooks <ben.dooks@...ethink.co.uk>,
        YueHaibing <yuehaibing@...wei.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Alexander Sverdlin <alexander.sverdlin@...ia.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [v2] hwrng: ks-sa - 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>
---

Changelog:

v2: - Use pm_runtime_put_noidle() instead of pm_runtime_put_sync().
---
 drivers/char/hw_random/ks-sa-rng.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/char/hw_random/ks-sa-rng.c b/drivers/char/hw_random/ks-sa-rng.c
index e2330e757f1f..001617033d6a 100644
--- a/drivers/char/hw_random/ks-sa-rng.c
+++ b/drivers/char/hw_random/ks-sa-rng.c
@@ -244,6 +244,7 @@ static int ks_sa_rng_probe(struct platform_device *pdev)
 	ret = pm_runtime_get_sync(dev);
 	if (ret < 0) {
 		dev_err(dev, "Failed to enable SA power-domain\n");
+		pm_runtime_put_noidle(dev);
 		pm_runtime_disable(dev);
 		return ret;
 	}
-- 
2.17.1