linux-kernel - [PATCH 3.16.y-ckt 059/126] thermal: exynos: Fix unbalanced regulator disable on probe failure

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Message-Id: <1449653896-5236-60-git-send-email-luis.henriques@canonical.com>
Date:	Wed,  9 Dec 2015 09:37:09 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 059/126] thermal: exynos: Fix unbalanced regulator disable on probe failure

3.16.7-ckt21 -stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 824ead03b78403a21449cb7eb153a4344cd3b4c8 upstream.

During probe if the regulator could not be enabled, the error exit path
would still disable it. This could lead to unbalanced counter of
regulator enable/disable.

The patch moves code for getting and enabling the regulator from
exynos_map_dt_data() to probe function because it is really not a part
of getting Device Tree properties.

Acked-by: Lukasz Majewski <l.majewski@...sung.com>
Tested-by: Lukasz Majewski <l.majewski@...sung.com>
Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Fixes: 5f09a5cbd14a ("thermal: exynos: Disable the regulator on probe failure")
Signed-off-by: Eduardo Valentin <edubezval@...il.com>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/thermal/samsung/exynos_tmu.c | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index efed4eedf47f..bd3ba217386e 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -558,27 +558,10 @@ static int exynos_map_dt_data(struct platform_device *pdev)
 	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
 	struct exynos_tmu_platform_data *pdata;
 	struct resource res;
-	int ret;
 
 	if (!data || !pdev->dev.of_node)
 		return -ENODEV;
 
-	/*
-	 * Try enabling the regulator if found
-	 * TODO: Add regulator as an SOC feature, so that regulator enable
-	 * is a compulsory call.
-	 */
-	data->regulator = devm_regulator_get(&pdev->dev, "vtmu");
-	if (!IS_ERR(data->regulator)) {
-		ret = regulator_enable(data->regulator);
-		if (ret) {
-			dev_err(&pdev->dev, "failed to enable vtmu\n");
-			return ret;
-		}
-	} else {
-		dev_info(&pdev->dev, "Regulator node (vtmu) not found\n");
-	}
-
 	data->id = of_alias_get_id(pdev->dev.of_node, "tmuctrl");
 	if (data->id < 0)
 		data->id = 0;
@@ -643,6 +626,22 @@ static int exynos_tmu_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, data);
 	mutex_init(&data->lock);
 
+	/*
+	 * Try enabling the regulator if found
+	 * TODO: Add regulator as an SOC feature, so that regulator enable
+	 * is a compulsory call.
+	 */
+	data->regulator = devm_regulator_get(&pdev->dev, "vtmu");
+	if (!IS_ERR(data->regulator)) {
+		ret = regulator_enable(data->regulator);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to enable vtmu\n");
+			return ret;
+		}
+	} else {
+		dev_info(&pdev->dev, "Regulator node (vtmu) not found\n");
+	}
+
 	ret = exynos_map_dt_data(pdev);
 	if (ret)
 		return ret;
--
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