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regulator: ltc3589: Fix notifier mutex lock warning 

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: 3eb2c7ecb7 ("regulator: Add LTC3589 support")
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>
hifive-unleashed-5.2
Steve Twiss 2019-02-26 15:35:35 +00:00 committed by Mark Brown
parent 89b2758c19
commit f132da2534
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GPG Key ID: 24D68B725D5487D0
1 changed files with 8 additions and 2 deletions
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10
drivers/regulator/ltc3589.c
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@ -419,16 +419,22 @@ static irqreturn_t ltc3589_isr(int irq, void *dev_id)
if (irqstat & LTC3589_IRQSTAT_THERMAL_WARN) {
event = REGULATOR_EVENT_OVER_TEMP;
for (i = 0; i < LTC3589_NUM_REGULATORS; i++)
for (i = 0; i < LTC3589_NUM_REGULATORS; i++) {
regulator_lock(ltc3589->regulators[i]);
regulator_notifier_call_chain(ltc3589->regulators[i],
event, NULL);
regulator_unlock(ltc3589->regulators[i]);
}
}
if (irqstat & LTC3589_IRQSTAT_UNDERVOLT_WARN) {
event = REGULATOR_EVENT_UNDER_VOLTAGE;
for (i = 0; i < LTC3589_NUM_REGULATORS; i++)
for (i = 0; i < LTC3589_NUM_REGULATORS; i++) {
regulator_lock(ltc3589->regulators[i]);
regulator_notifier_call_chain(ltc3589->regulators[i],
event, NULL);
regulator_unlock(ltc3589->regulators[i]);
}
}
/* Clear warning condition */