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authorSteve Twiss <stwiss.opensource@diasemi.com>2019-02-26 16:38:56 +0100
committerMark Brown <broonie@kernel.org>2019-03-13 16:12:09 +0100
commit769fc8d4182c1d1875db7859852afeb436714c5c (patch)
treea6374d45b84c05631025af59bfa08ecedb53f9e7 /drivers/regulator/ltc3676.c
parentregulator: ltc3589: Fix notifier mutex lock warning (diff)
downloadlinux-769fc8d4182c1d1875db7859852afeb436714c5c.tar.xz
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regulator: ltc3676: 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: 37b918a034fe ("regulator: Add LTC3676 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/ltc3676.c')
-rw-r--r--drivers/regulator/ltc3676.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/regulator/ltc3676.c b/drivers/regulator/ltc3676.c
index e6d66e492b85..4be90c78c720 100644
--- a/drivers/regulator/ltc3676.c
+++ b/drivers/regulator/ltc3676.c
@@ -285,17 +285,23 @@ static irqreturn_t ltc3676_isr(int irq, void *dev_id)
if (irqstat & LTC3676_IRQSTAT_THERMAL_WARN) {
dev_warn(dev, "Over-temperature Warning\n");
event = REGULATOR_EVENT_OVER_TEMP;
- for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
+ for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
+ regulator_lock(ltc3676->regulators[i]);
regulator_notifier_call_chain(ltc3676->regulators[i],
event, NULL);
+ regulator_unlock(ltc3676->regulators[i]);
+ }
}
if (irqstat & LTC3676_IRQSTAT_UNDERVOLT_WARN) {
dev_info(dev, "Undervoltage Warning\n");
event = REGULATOR_EVENT_UNDER_VOLTAGE;
- for (i = 0; i < LTC3676_NUM_REGULATORS; i++)
+ for (i = 0; i < LTC3676_NUM_REGULATORS; i++) {
+ regulator_lock(ltc3676->regulators[i]);
regulator_notifier_call_chain(ltc3676->regulators[i],
event, NULL);
+ regulator_unlock(ltc3676->regulators[i]);
+ }
}
/* Clear warning condition */