[PATCH] regulator: wm831x: Fix notifier mutex lock warning

[Steve Twiss]

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: e4ee831f949a ("regulator: Add WM831x DC-DC buck convertor 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-dcdc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/regulator/wm831x-dcdc.c b/drivers/regulator/wm831x-dcdc.c
index 12b422373580..d1873f94bca7 100644
--- a/drivers/regulator/wm831x-dcdc.c
+++ b/drivers/regulator/wm831x-dcdc.c
@@ -183,9 +183,11 @@ static irqreturn_t wm831x_dcdc_uv_irq(int irq, void *data)
 {
 	struct wm831x_dcdc *dcdc = data;
 
+	regulator_lock(dcdc->regulator);
 	regulator_notifier_call_chain(dcdc->regulator,
 				      REGULATOR_EVENT_UNDER_VOLTAGE,
 				      NULL);
+	regulator_unlock(dcdc->regulator);
 
 	return IRQ_HANDLED;
 }
@@ -194,9 +196,11 @@ static irqreturn_t wm831x_dcdc_oc_irq(int irq, void *data)
 {
 	struct wm831x_dcdc *dcdc = data;
 
+	regulator_lock(dcdc->regulator);
 	regulator_notifier_call_chain(dcdc->regulator,
 				      REGULATOR_EVENT_OVER_CURRENT,
 				      NULL);
+	regulator_unlock(dcdc->regulator);
 
 	return IRQ_HANDLED;
 }
-- 
2.20.1