diff options
| author | Steve Twiss <stwiss.opensource@diasemi.com> | 2019-02-26 18:44:54 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-31 16:43:57 +0300 |
| commit | 4e133564312fea05f3f7060c4ec6cc64ebd5515e (patch) | |
| tree | f938c5d538211276ca9db82c056e87abc87df688 /drivers/regulator | |
| parent | a694126eeae02c47b306b0f17b670b9bd97ec2b4 (diff) | |
| download | linux-4e133564312fea05f3f7060c4ec6cc64ebd5515e.tar.xz | |
regulator: pv88080: Fix notifier mutex lock warning
[ Upstream commit 1867af94cfdf37fc70fe67b3d522e78352800196 ]
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>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/regulator')
| -rw-r--r-- | drivers/regulator/pv88080-regulator.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/regulator/pv88080-regulator.c b/drivers/regulator/pv88080-regulator.c index bdddacdbeb99..6279216fb254 100644 --- a/drivers/regulator/pv88080-regulator.c +++ b/drivers/regulator/pv88080-regulator.c @@ -345,9 +345,11 @@ 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]); } } @@ -362,9 +364,11 @@ 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]); } } |