Applied "regulator: wm831x ldo: Fix notifier mutex lock warning" to the regulator tree
- Date: Thu, 14 Mar 2019 15:54:03 +0000 (GMT)
- From: Mark Brown <broonie@xxxxxxxxxx>
- Subject: Applied "regulator: wm831x ldo: Fix notifier mutex lock warning" to the regulator tree
regulator: wm831x ldo: Fix notifier mutex lock warning
has been applied to the regulator tree at
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>From 8be64b6d87bd47d81753b60ddafe70102ebfd76b Mon Sep 17 00:00:00 2001
From: Steve Twiss <stwiss.opensource@xxxxxxxxxxx>
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 <Adam.Thomson.Opensource@xxxxxxxxxxx>
Signed-off-by: Steve Twiss <stwiss.opensource@xxxxxxxxxxx>
Acked-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
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
@@ -51,9 +51,11 @@ static irqreturn_t wm831x_ldo_uv_irq(int irq, void *data)
struct wm831x_ldo *ldo = data;