[ Upstream commit 1867af94cfdf37fc70fe67b3d522e78352800196 ]
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: 99cf3af5e2d5 ("regulator: pv88080: new regulator driver")
Suggested-by: Adam Thomson <Adam.Thomson.Opensource@xxxxxxxxxxx>
Signed-off-by: Steve Twiss <stwiss.opensource@xxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/regulator/pv88080-regulator.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/regulator/pv88080-regulator.c b/drivers/regulator/pv88080-regulator.c
index 9a08cb2de501e..d99f1b9fa0756 100644
--- a/drivers/regulator/pv88080-regulator.c
+++ b/drivers/regulator/pv88080-regulator.c
@@ -384,9 +384,11 @@ static irqreturn_t pv88080_irq_handler(int irq, void *data)
if (reg_val & PV88080_E_VDD_FLT) {
for (i = 0; i < PV88080_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]);
}
}
@@ -401,9 +403,11 @@ static irqreturn_t pv88080_irq_handler(int irq, void *data)
if (reg_val & PV88080_E_OVER_TEMP) {
for (i = 0; i < PV88080_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
