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Message-Id: <1420638683-20216-1-git-send-email-ashayj@codeaurora.org>
Date: Wed, 7 Jan 2015 19:21:23 +0530
From: Ashay Jaiswal <ashayj@...eaurora.org>
To: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
Anirudh Ghayal <aghayal@...eaurora.org>,
Ashay Jaiswal <ashayj@...eaurora.org>
Subject: [PATCH] regulator: core: fix race condition in regulator_put()
The regulator framework maintains a list of consumer regulators
for a regulator device and protects it from concurrent access
using the regulator device's mutex lock.
In the case of regulator_put() the consumer is removed without
holding the regulator device's mutex, resulting in a race condition
between any regulator operation which traverses the consumer list
and regulator_put() which releases the consumer regulator.
Fix this race condition by holding the regulator device's mutex while
removing and releasing the consumer regulator.
Signed-off-by: Ashay Jaiswal <ashayj@...eaurora.org>
---
drivers/regulator/core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index c2554d8..3845397 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1498,6 +1498,7 @@ static void _regulator_put(struct regulator *regulator)
rdev = regulator->rdev;
+ mutex_lock(&rdev->mutex);
debugfs_remove_recursive(regulator->debugfs);
/* remove any sysfs entries */
@@ -1511,6 +1512,7 @@ static void _regulator_put(struct regulator *regulator)
rdev->exclusive = 0;
module_put(rdev->owner);
+ mutex_unlock(&rdev->mutex);
}
/**
--
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a Linux Foundation Collaborative Project
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