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Date: Wed, 29 May 2019 20:06:26 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Adam Thomson <Adam.Thomson.Opensource@...semi.com>, Steve Twiss <stwiss.opensource@...semi.com>, Mark Brown <broonie@...nel.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.1 388/405] regulator: pv88090: Fix notifier mutex lock warning [ Upstream commit 275513b7695a61b75b2546406ecd0f8e3d9fc8be ] 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> Signed-off-by: Mark Brown <broonie@...nel.org> Signed-off-by: Sasha Levin <sashal@...nel.org> --- 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 6e97cc6df2eec..90f4f907fb3fb 100644 --- a/drivers/regulator/pv88090-regulator.c +++ b/drivers/regulator/pv88090-regulator.c @@ -237,9 +237,11 @@ 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]); } } @@ -254,9 +256,11 @@ 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]); } } -- 2.20.1
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