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SubjectApplied "regulator: da9211: Fix notifier mutex lock warning" to the regulator tree
The patch

regulator: da9211: Fix notifier mutex lock warning

has been applied to the regulator tree at

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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
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From 65378de3359d30ebce44762d8b8027f372b5b1c4 Mon Sep 17 00:00:00 2001
From: Steve Twiss <>
Date: Tue, 26 Feb 2019 15:27:57 +0000
Subject: [PATCH] regulator: da9211: 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: 1028a37daa14 ("regulator: da9211: new regulator driver")
Suggested-by: Adam Thomson <>
Signed-off-by: Steve Twiss <>
Signed-off-by: Mark Brown <>
drivers/regulator/da9211-regulator.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/regulator/da9211-regulator.c b/drivers/regulator/da9211-regulator.c
index 109ee12d4362..4d7fe4819c1c 100644
--- a/drivers/regulator/da9211-regulator.c
+++ b/drivers/regulator/da9211-regulator.c
@@ -322,8 +322,10 @@ static irqreturn_t da9211_irq_handler(int irq, void *data)
goto error_i2c;

if (reg_val & DA9211_E_OV_CURR_A) {
+ regulator_lock(chip->rdev[0]);
+ regulator_unlock(chip->rdev[0]);

err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
@@ -334,8 +336,10 @@ static irqreturn_t da9211_irq_handler(int irq, void *data)

if (reg_val & DA9211_E_OV_CURR_B) {
+ regulator_lock(chip->rdev[1]);
+ regulator_unlock(chip->rdev[1]);

err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
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