linux-kernel - [PATCH 3.10 186/319] hwrng: exynos - Disable runtime PM on probe failure

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Date:   Sun,  5 Feb 2017 20:20:08 +0100
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Krzysztof Kozlowski <k.kozlowski@...sung.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 186/319] hwrng: exynos - Disable runtime PM on probe failure

From: Krzysztof Kozlowski <k.kozlowski@...sung.com>

commit 48a61e1e2af8020f11a2b8f8dc878144477623c6 upstream.

Add proper error path (for disabling runtime PM) when registering of
hwrng fails.

Fixes: b329669ea0b5 ("hwrng: exynos - Add support for Exynos random number generator")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/char/hw_random/exynos-rng.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/char/hw_random/exynos-rng.c b/drivers/char/hw_random/exynos-rng.c
index 402ccfb..b6ec73f 100644
--- a/drivers/char/hw_random/exynos-rng.c
+++ b/drivers/char/hw_random/exynos-rng.c
@@ -105,6 +105,7 @@ static int exynos_rng_probe(struct platform_device *pdev)
 {
 	struct exynos_rng *exynos_rng;
 	struct resource *res;
+	int ret;
 
 	exynos_rng = devm_kzalloc(&pdev->dev, sizeof(struct exynos_rng),
 					GFP_KERNEL);
@@ -132,7 +133,13 @@ static int exynos_rng_probe(struct platform_device *pdev)
 	pm_runtime_use_autosuspend(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
 
-	return hwrng_register(&exynos_rng->rng);
+	ret = hwrng_register(&exynos_rng->rng);
+	if (ret) {
+		pm_runtime_dont_use_autosuspend(&pdev->dev);
+		pm_runtime_disable(&pdev->dev);
+	}
+
+	return ret;
 }
 
 static int exynos_rng_remove(struct platform_device *pdev)
-- 
2.8.0.rc2.1.gbe9624a