[ Upstream commit 5e6afb3832bedf420dd8e4c5b32ed85117c5087d ]
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: f6130be652d0 ("regulator: DA9055 regulator driver")
Suggested-by: Adam Thomson <adam.thomson.opensou...@diasemi.com>
Signed-off-by: Steve Twiss <stwiss.opensou...@diasemi.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/regulator/da9055-regulator.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/regulator/da9055-regulator.c
b/drivers/regulator/da9055-regulator.c
index 3c6fac7936585..3ade4b8d204eb 100644
--- a/drivers/regulator/da9055-regulator.c
+++ b/drivers/regulator/da9055-regulator.c
@@ -487,8 +487,10 @@ static irqreturn_t da9055_ldo5_6_oc_irq(int irq, void
*data)
{
struct da9055_regulator *regulator = data;
+ regulator_lock(regulator->rdev);
regulator_notifier_call_chain(regulator->rdev,
REGULATOR_EVENT_OVER_CURRENT, NULL);
+ regulator_unlock(regulator->rdev);
return IRQ_HANDLED;
}
--
2.20.1
