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SubjectApplied "regulator: da9055: Fix notifier mutex lock warning" to the regulator tree
The patch

regulator: da9055: Fix notifier mutex lock warning

has been applied to the regulator tree at

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

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From 5e6afb3832bedf420dd8e4c5b32ed85117c5087d Mon Sep 17 00:00:00 2001
From: Steve Twiss <>
Date: Tue, 26 Feb 2019 14:59:59 +0000
Subject: [PATCH] regulator: da9055: Fix notifier mutex lock warning

The mutex for the regulator_dev must be controlled by the caller of
the regulator_notifier_call_chain(), as described in the comment
for that function.

Failure to mutex lock and unlock surrounding the notifier call results
in a kernel WARN_ON_ONCE() which will dump a backtrace for the
regulator_notifier_call_chain() when that function call is first made.
The mutex can be controlled using the regulator_lock/unlock() API.

Fixes: f6130be652d0 ("regulator: DA9055 regulator driver")
Suggested-by: Adam Thomson <>
Signed-off-by: Steve Twiss <>
Signed-off-by: Mark Brown <>
drivers/regulator/da9055-regulator.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/regulator/da9055-regulator.c b/drivers/regulator/da9055-regulator.c
index 3c6fac793658..3ade4b8d204e 100644
--- a/drivers/regulator/da9055-regulator.c
+++ b/drivers/regulator/da9055-regulator.c
@@ -487,8 +487,10 @@ static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void *data)
struct da9055_regulator *regulator = data;

+ regulator_lock(regulator->rdev);
+ regulator_unlock(regulator->rdev);

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