linux-kernel - [PATCH] extcon: arizona: unlock mutex on error path in arizona

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Date:	Sun,  4 Nov 2012 13:19:46 -0700
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
	ldv-project@...uxtesting.org
Subject: [PATCH] extcon: arizona: unlock mutex on error path in arizona_micdet()

If regmap_read() failed, arizona_micdet() returns IRQ_NONE
leaving &info->lock mutex locked as opposed to all other return paths.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/extcon/extcon-arizona.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c
index cdab9e5..d876a54 100644
--- a/drivers/extcon/extcon-arizona.c
+++ b/drivers/extcon/extcon-arizona.c
@@ -166,6 +166,7 @@ static irqreturn_t arizona_micdet(int irq, void *data)
 	ret = regmap_read(arizona->regmap, ARIZONA_MIC_DETECT_3, &val);
 	if (ret != 0) {
 		dev_err(arizona->dev, "Failed to read MICDET: %d\n", ret);
+		mutex_unlock(&info->lock);
 		return IRQ_NONE;
 	}
 
-- 
1.7.9.5

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