[PATCH 03/13] regulator: da9063: 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: 69ca3e58d178 ("regulator: da9063: Add Dialog DA9063 voltage regulators 
support.")
Suggested-by: Adam Thomson <adam.thomson.opensou...@diasemi.com>
Signed-off-by: Steve Twiss <stwiss.opensou...@diasemi.com>
---
 drivers/regulator/da9063-regulator.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/da9063-regulator.c 
b/drivers/regulator/da9063-regulator.c
index 8cbcd2a..d3ea73a 100644
--- a/drivers/regulator/da9063-regulator.c
+++ b/drivers/regulator/da9063-regulator.c
@@ -615,9 +615,12 @@ static irqreturn_t da9063_ldo_lim_event(int irq, void 
*data)
                if (regl->info->oc_event.reg != DA9063_REG_STATUS_D)
                        continue;
 
-               if (BIT(regl->info->oc_event.lsb) & bits)
+               if (BIT(regl->info->oc_event.lsb) & bits) {
+                       regulator_lock(regl->rdev);
                        regulator_notifier_call_chain(regl->rdev,
                                        REGULATOR_EVENT_OVER_CURRENT, NULL);
+                       regulator_unlock(regl->rdev);
+               }
        }
 
        return IRQ_HANDLED;
-- 
1.9.3