regulator: core: Decouple regulators on regulator_unregister()

Regulators shall be uncoupled if one of the couples disappear.

Signed-off-by: Dmitry Osipenko <[email protected]>
Signed-off-by: Mark Brown <[email protected]>

Author: digetx

drivers/regulator/core.c

@@ -4518,6 +4518,43 @@ static void regulator_resolve_coupling(struct regulator_dev *rdev)
 	}
 }
 
+static void regulator_remove_coupling(struct regulator_dev *rdev)
+{
+	struct coupling_desc *__c_desc, *c_desc = &rdev->coupling_desc;
+	struct regulator_dev *__c_rdev, *c_rdev;
+	unsigned int __n_coupled, n_coupled;
+	int i, k;
+
+	n_coupled = c_desc->n_coupled;
+
+	for (i = 1; i < n_coupled; i++) {
+		c_rdev = c_desc->coupled_rdevs[i];
+
+		if (!c_rdev)
+			continue;
+
+		regulator_lock(c_rdev);
+
+		__c_desc = &c_rdev->coupling_desc;
+		__n_coupled = __c_desc->n_coupled;
+
+		for (k = 1; k < __n_coupled; k++) {
+			__c_rdev = __c_desc->coupled_rdevs[k];
+
+			if (__c_rdev == rdev) {
+				__c_desc->coupled_rdevs[k] = NULL;
+				__c_desc->n_resolved--;
+				break;
+			}
+		}
+
+		regulator_unlock(c_rdev);
+
+		c_desc->coupled_rdevs[i] = NULL;
+		c_desc->n_resolved--;
+	}
+}
+
 static int regulator_init_coupling(struct regulator_dev *rdev)
 {
 	int n_phandles;
@@ -4776,6 +4813,7 @@ void regulator_unregister(struct regulator_dev *rdev)
 	debugfs_remove_recursive(rdev->debugfs);
 	flush_work(&rdev->disable_work.work);
 	WARN_ON(rdev->open_count);
+	regulator_remove_coupling(rdev);
 	unset_regulator_supplies(rdev);
 	list_del(&rdev->list);
 	regulator_ena_gpio_free(rdev);