Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Message-ID: <0e0ffab52b8defcccf8b64ac3f0badbc9dacfcda.1551808797.git.stwiss.opensource@diasemi.com>
In-Reply-To: <cover.1551808797.git.stwiss.opensource@diasemi.com>
References: <cover.1551808797.git.stwiss.opensource@diasemi.com>
From:   Steve Twiss <stwiss.opensource@diasemi.com>
Date:   Tue, 26 Feb 2019 15:46:55 +0000
Subject: [PATCH 10/13] regulator: pv88090: Fix notifier mutex lock warning
To:     Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>
CC:     Support Opensource <support.opensource@diasemi.com>,
        LKML <linux-kernel@vger.kernel.org>
MIME-Version: 1.0
Content-Type: text/plain
X-KSE-AttachmentFiltering-Interceptor-Info: protection disabled
X-KSE-ServerInfo: sw-ex-cashub01.diasemi.com, 9
X-KSE-Antivirus-Interceptor-Info: scan successful
X-KSE-Antivirus-Info: Clean, bases: 05/03/2019 17:23:00
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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@diasemi.com>
Signed-off-by: Steve Twiss <stwiss.opensource@diasemi.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