linux-kernel - [PATCH 3.16.y-ckt 049/130] thermal: exynos: Disable the regulator on probe failure

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Date:	Fri,  4 Sep 2015 14:07:17 +0100
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>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Eduardo Valentin <edubezval@...il.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 049/130] thermal: exynos: Disable the regulator on probe failure

3.16.7-ckt17 -stable review patch.  If anyone has any objections, please let me know.

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

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

commit 5f09a5cbd14ae16e93866040fa44d930ff885650 upstream.

During probe the regulator (if present) was enabled but not disabled in
case of failure. So an unsuccessful probe lead to enabling the
regulator which was actually not needed because the device was not
enabled.

Additionally each deferred probe lead to increase of regulator enable
count so it would not be effectively disabled during removal of the
device.

Test HW: Exynos4412 - Trats2 board

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Fixes: 498d22f616f6 ("thermal: exynos: Support for TMU regulator defined at device tree")
Reviewed-by: Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Signed-off-by: Lukasz Majewski <l.majewski@...sung.com>
Tested-by: Lukasz Majewski <l.majewski@...sung.com>
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 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
index d7ca9f49c9cb..efed4eedf47f 100644
--- a/drivers/thermal/samsung/exynos_tmu.c
+++ b/drivers/thermal/samsung/exynos_tmu.c
@@ -752,6 +752,8 @@ err_clk:
 err_clk_sec:
 	if (!IS_ERR(data->clk_sec))
 		clk_unprepare(data->clk_sec);
+	if (!IS_ERR_OR_NULL(data->regulator))
+		regulator_disable(data->regulator);
 	return ret;
 }
 
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