Messages in this thread Patch in this message | | | From | Steve Twiss <> | Date | Tue, 26 Feb 2019 15:44:54 +0000 | Subject | [PATCH 09/13] regulator: pv88080: 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: 99cf3af5e2d5 ("regulator: pv88080: new regulator driver") Suggested-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.com> --- drivers/regulator/pv88080-regulator.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/regulator/pv88080-regulator.c b/drivers/regulator/pv88080-regulator.c index 9a08cb2..d99f1b9 100644 --- a/drivers/regulator/pv88080-regulator.c +++ b/drivers/regulator/pv88080-regulator.c @@ -384,9 +384,11 @@ static irqreturn_t pv88080_irq_handler(int irq, void *data) if (reg_val & PV88080_E_VDD_FLT) { for (i = 0; i < PV88080_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]); } } @@ -401,9 +403,11 @@ static irqreturn_t pv88080_irq_handler(int irq, void *data) if (reg_val & PV88080_E_OVER_TEMP) { for (i = 0; i < PV88080_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]); } } -- 1.9.3
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