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| author | Steve Twiss <stwiss.opensource@diasemi.com> | 2019-02-26 15:35:35 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2019-03-13 15:11:55 +0000 |
| commit | f132da2534ec6599c78c4adcef15340cff2e9dd9 (patch) | |
| tree | d9e011faaca74d8f443173417d935bbbde7662ad /drivers/regulator/ltc3589.c | |
| parent | 89b2758c192c35068b07766a6830433bfbdc1f44 (diff) | |
| download | linux-f132da2534ec6599c78c4adcef15340cff2e9dd9.tar.gz linux-f132da2534ec6599c78c4adcef15340cff2e9dd9.tar.bz2 linux-f132da2534ec6599c78c4adcef15340cff2e9dd9.zip | |
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: 3eb2c7ecb7ea ("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>
Diffstat (limited to 'drivers/regulator/ltc3589.c')
| -rw-r--r-- | drivers/regulator/ltc3589.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/regulator/ltc3589.c b/drivers/regulator/ltc3589.c index 63f724f260ef..75089b037b72 100644 --- a/drivers/regulator/ltc3589.c +++ b/drivers/regulator/ltc3589.c @@ -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 */ |