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regulator: lp8755: 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: b59320cc5a ("regulator: lp8755: new driver for LP8755")
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 15:32:18 +00:00 committed by Mark Brown
parent 65378de335
commit 89b2758c19
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 12 additions and 3 deletions
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15
drivers/regulator/lp8755.c
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@ -372,10 +372,13 @@ static irqreturn_t lp8755_irq_handler(int irq, void *data)
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
if ((flag0 & (0x4 << icnt))
&& (pchip->irqmask & (0x04 << icnt))
&& (pchip->rdev[icnt] != NULL))
&& (pchip->rdev[icnt] != NULL)) {
regulator_lock(pchip->rdev[icnt]);
regulator_notifier_call_chain(pchip->rdev[icnt],
LP8755_EVENT_PWR_FAULT,
NULL);
regulator_unlock(pchip->rdev[icnt]);
}
/* read flag1 register */
ret = lp8755_read(pchip, 0x0E, &flag1);
@ -389,18 +392,24 @@ static irqreturn_t lp8755_irq_handler(int irq, void *data)
/* send OCP event to all regulator devices */
if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
if (pchip->rdev[icnt] != NULL)
if (pchip->rdev[icnt] != NULL) {
regulator_lock(pchip->rdev[icnt]);
regulator_notifier_call_chain(pchip->rdev[icnt],
LP8755_EVENT_OCP,
NULL);
regulator_unlock(pchip->rdev[icnt]);
}
/* send OVP event to all regulator devices */
if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
if (pchip->rdev[icnt] != NULL)
if (pchip->rdev[icnt] != NULL) {
regulator_lock(pchip->rdev[icnt]);
regulator_notifier_call_chain(pchip->rdev[icnt],
LP8755_EVENT_OVP,
NULL);
regulator_unlock(pchip->rdev[icnt]);
}
return IRQ_HANDLED;
err_i2c: