pinctrl: core: Hold pinctrldev_list_mutex mutex while traversing pinctrldev_list

index c8fcedb..c670527 100644
@@ -392,6 +392,8 @@ static int pinctrl_get_device_gpio_range(unsigned gpio,
 {
 	struct pinctrl_dev *pctldev = NULL;
 
+	mutex_lock(&pinctrldev_list_mutex);
+
 	/* Loop over the pin controllers */
 	list_for_each_entry(pctldev, &pinctrldev_list, node) {
 		struct pinctrl_gpio_range *range;

@@ -400,10 +402,13 @@ static int pinctrl_get_device_gpio_range(unsigned gpio,
 		if (range != NULL) {
 			*outdev = pctldev;
 			*outrange = range;
+			mutex_unlock(&pinctrldev_list_mutex);
 			return 0;
 		}
 	}
 
+	mutex_unlock(&pinctrldev_list_mutex);
+
 	return -EPROBE_DEFER;
 }
 

index c670527..4adef2f 100644
@@ -357,14 +357,17 @@ static bool pinctrl_ready_for_gpio_range(unsigned gpio)
 	/* Loop over the pin controllers */
 	list_for_each_entry(pctldev, &pinctrldev_list, node) {
 		/* Loop over the ranges */
+		mutex_lock(&pctldev->mutex);
 		list_for_each_entry(range, &pctldev->gpio_ranges, node) {
 			/* Check if any gpio range overlapped with gpio chip */
 			if (range->base + range->npins - 1 < chip->base ||
 			    range->base > chip->base + chip->ngpio - 1)
 				continue;
+			mutex_unlock(&pctldev->mutex);
 			mutex_unlock(&pinctrldev_list_mutex);
 			return true;
 		}
+		mutex_unlock(&pctldev->mutex);
 	}
 
 	mutex_unlock(&pinctrldev_list_mutex);