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regulator: da9055: Fix notifier mutex lock warning

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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: f6130be652 ("regulator: DA9055 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>
This commit is contained in:
Steve Twiss 2019-02-26 14:59:59 +00:00 committed by Mark Brown
parent 705e2a905a
commit 5e6afb3832
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1 changed files with 2 additions and 0 deletions
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drivers/regulator/da9055-regulator.c
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@ -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;
}