1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/regulator/wm8350-regulator.c b/drivers/regulator/wm8350-regulator.c
index 5056e23e4414..afad611fbb80 100644
--- a/drivers/regulator/wm8350-regulator.c
+++ b/drivers/regulator/wm8350-regulator.c
@@ -1293,6 +1293,7 @@ static void pmic_uv_handler(struct wm8350 *wm8350, int irq, void *data)
 {
         struct regulator_dev *rdev = (struct regulator_dev *)data;
 
+        mutex_lock(&rdev->mutex);
         if (irq == WM8350_IRQ_CS1 || irq == WM8350_IRQ_CS2)
                 regulator_notifier_call_chain(rdev,
                                               REGULATOR_EVENT_REGULATION_OUT,
@@ -1301,6 +1302,7 @@ static void pmic_uv_handler(struct wm8350 *wm8350, int irq, void *data)
                 regulator_notifier_call_chain(rdev,
                                               REGULATOR_EVENT_UNDER_VOLTAGE,
                                               wm8350);
+        mutex_unlock(&rdev->mutex);
 }
 
 static int wm8350_regulator_probe(struct platform_device *pdev)