[ Upstream commit 65378de3359d30ebce44762d8b8027f372b5b1c4 ]
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: 1028a37daa14 ("regulator: da9211: 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/da9211-regulator.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/regulator/da9211-regulator.c b/drivers/regulator/da9211-regulator.c
index 109ee12d43626..4d7fe4819c1ce 100644
--- a/drivers/regulator/da9211-regulator.c
+++ b/drivers/regulator/da9211-regulator.c
@@ -322,8 +322,10 @@ static irqreturn_t da9211_irq_handler(int irq, void *data)
goto error_i2c;
if (reg_val & DA9211_E_OV_CURR_A) {
+ regulator_lock(chip->rdev[0]);
regulator_notifier_call_chain(chip->rdev[0],
REGULATOR_EVENT_OVER_CURRENT, NULL);
+ regulator_unlock(chip->rdev[0]);
err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
DA9211_E_OV_CURR_A);
@@ -334,8 +336,10 @@ static irqreturn_t da9211_irq_handler(int irq, void *data)
}
if (reg_val & DA9211_E_OV_CURR_B) {
+ regulator_lock(chip->rdev[1]);
regulator_notifier_call_chain(chip->rdev[1],
REGULATOR_EVENT_OVER_CURRENT, NULL);
+ regulator_unlock(chip->rdev[1]);
err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
DA9211_E_OV_CURR_B);
--
2.20.1
