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Message-ID: <0e0ffab52b8defcccf8b64ac3f0badbc9dacfcda.1551808797.git.stwiss.opensource@diasemi.com>
Date: Tue, 26 Feb 2019 15:46:55 +0000
From: Steve Twiss <stwiss.opensource@...semi.com>
To: Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>
CC: Support Opensource <support.opensource@...semi.com>,
LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 10/13] regulator: pv88090: 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: c90456e36d9c ("regulator: pv88090: new regulator driver")
Suggested-by: Adam Thomson <Adam.Thomson.Opensource@...semi.com>
Signed-off-by: Steve Twiss <stwiss.opensource@...semi.com>
---
drivers/regulator/pv88090-regulator.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/regulator/pv88090-regulator.c b/drivers/regulator/pv88090-regulator.c
index 7a0c159..b4ff646 100644
--- a/drivers/regulator/pv88090-regulator.c
+++ b/drivers/regulator/pv88090-regulator.c
@@ -274,9 +274,11 @@ static irqreturn_t pv88090_irq_handler(int irq, void *data)
if (reg_val & PV88090_E_VDD_FLT) {
for (i = 0; i < PV88090_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]);
}
}
@@ -291,9 +293,11 @@ static irqreturn_t pv88090_irq_handler(int irq, void *data)
if (reg_val & PV88090_E_OVER_TEMP) {
for (i = 0; i < PV88090_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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