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SubjectApplied "regulator: wm831x ldo: Fix notifier mutex lock warning" to the regulator tree
The patch

regulator: wm831x ldo: 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 8be64b6d87bd47d81753b60ddafe70102ebfd76b Mon Sep 17 00:00:00 2001
From: Steve Twiss <>
Date: Tue, 26 Feb 2019 15:54:01 +0000
Subject: [PATCH] regulator: wm831x ldo: 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: d1c6b4fe668b ("regulator: Add WM831x LDO support")
Suggested-by: Adam Thomson <>
Signed-off-by: Steve Twiss <>
Acked-by: Charles Keepax <>
Signed-off-by: Mark Brown <>
drivers/regulator/wm831x-ldo.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/regulator/wm831x-ldo.c b/drivers/regulator/wm831x-ldo.c
index e4a6f888484e..fcd038e7cd80 100644
--- a/drivers/regulator/wm831x-ldo.c
+++ b/drivers/regulator/wm831x-ldo.c
@@ -51,9 +51,11 @@ static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
struct wm831x_ldo *ldo = data;

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

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