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regulator: pv88060: 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: f307a7e9b7 ("regulator: pv88060: new 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 15:42:50 +00:00 committed by Mark Brown
parent 769fc8d418
commit f582136372
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1 changed files with 4 additions and 0 deletions
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4
drivers/regulator/pv88060-regulator.c
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@ -244,9 +244,11 @@ static irqreturn_t pv88060_irq_handler(int irq, void *data)
if (reg_val & PV88060_E_VDD_FLT) {
for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
if (chip->rdev[i] != NULL) {
regulator_lock(chip->rdev[i]);
regulator_notifier_call_chain(chip->rdev[i],
REGULATOR_EVENT_UNDER_VOLTAGE,
NULL);
regulator_unlock(chip->rdev[i]);
}
}
@ -261,9 +263,11 @@ static irqreturn_t pv88060_irq_handler(int irq, void *data)
if (reg_val & PV88060_E_OVER_TEMP) {
for (i = 0; i < PV88060_MAX_REGULATORS; i++) {
if (chip->rdev[i] != NULL) {
regulator_lock(chip->rdev[i]);
regulator_notifier_call_chain(chip->rdev[i],
REGULATOR_EVENT_OVER_TEMP,
NULL);
regulator_unlock(chip->rdev[i]);
}
}