releases/5.1.6/regulator-pv88060-fix-notifier-mutex-lock-warning.patch

From 9cb19f8dbaaf54f2e7deef51e706c3de232d4005 Mon Sep 17 00:00:00 2001
From: Steve Twiss <stwiss.opensource@diasemi.com>
Date: Tue, 26 Feb 2019 15:42:50 +0000
Subject: regulator: pv88060: Fix notifier mutex lock warning

[ Upstream commit f58213637206e190453e3bd91f98f535566290a3 ]

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: f307a7e9b7af ("regulator: pv88060: new regulator driver")
Suggested-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com>
Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/regulator/pv88060-regulator.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/regulator/pv88060-regulator.c b/drivers/regulator/pv88060-regulator.c
index 1600f98218912..810816e9df5d5 100644
--- a/drivers/regulator/pv88060-regulator.c
+++ b/drivers/regulator/pv88060-regulator.c
@@ -244,9 +244,11 @@ static irqreturn_t pv88060_irq_handler(int irq, void *data)
 	if (reg_val & PV88060_E_VDD_FLT) {
 		for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 			if (chip->rdev[i] != NULL) {
+				regulator_lock(chip->rdev[i]);
 				regulator_notifier_call_chain(chip->rdev[i],
 					REGULATOR_EVENT_UNDER_VOLTAGE,
 					NULL);
+				regulator_unlock(chip->rdev[i]);
 			}
 		}
 
@@ -261,9 +263,11 @@ static irqreturn_t pv88060_irq_handler(int irq, void *data)
 	if (reg_val & PV88060_E_OVER_TEMP) {
 		for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
 			if (chip->rdev[i] != NULL) {
+				regulator_lock(chip->rdev[i]);
 				regulator_notifier_call_chain(chip->rdev[i],
 					REGULATOR_EVENT_OVER_TEMP,
 					NULL);
+				regulator_unlock(chip->rdev[i]);
 			}
 		}
 
-- 
2.20.1