regulator: core: Don't allow to get regulator until all couples resolved

Don't allow to get regulator until all of its couples resolved because
consumer will get EPERM and coupling shall be transparent for the drivers.

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

Author: digetx

drivers/regulator/core.c

@@ -1747,6 +1747,16 @@ struct regulator *_regulator_get(struct device *dev, const char *id,
 		return regulator;
 	}
 
+	mutex_lock(&regulator_list_mutex);
+	ret = (rdev->coupling_desc.n_resolved != rdev->coupling_desc.n_coupled);
+	mutex_unlock(&regulator_list_mutex);
+
+	if (ret != 0) {
+		regulator = ERR_PTR(-EPROBE_DEFER);
+		put_device(&rdev->dev);
+		return regulator;
+	}
+
 	ret = regulator_resolve_supply(rdev);
 	if (ret < 0) {
 		regulator = ERR_PTR(ret);