diff --git a/drivers/power/supply/charger-manager.c b/drivers/power/supply/charger-manager.c index 71b6e49a835f..fd4cd9cd2ce2 100644 --- a/drivers/power/supply/charger-manager.c +++ b/drivers/power/supply/charger-manager.c @@ -1014,6 +1014,29 @@ static int charger_extcon_init(struct charger_manager *cm, return 0; } +static int charger_manager_get_regulators(struct charger_manager *cm) +{ + struct charger_desc *desc = cm->desc; + struct charger_regulator *charger; + int i, ret; + + for (i = 0; i < desc->num_charger_regulators; i++) { + charger = &desc->charger_regulators[i]; + charger->consumer = regulator_get(cm->dev, + charger->regulator_name); + if (IS_ERR(charger->consumer)) { + dev_err(cm->dev, "Cannot find charger(%s)\n", + charger->regulator_name); + ret = PTR_ERR(charger->consumer); + while (i-- > 0) + regulator_put(desc->charger_regulators[i].consumer); + return ret; + } + charger->cm = cm; + } + return 0; +} + /** * charger_manager_register_extcon - Register extcon device to receive state * of charger cable. @@ -1036,15 +1059,6 @@ static int charger_manager_register_extcon(struct charger_manager *cm) for (i = 0; i < desc->num_charger_regulators; i++) { charger = &desc->charger_regulators[i]; - charger->consumer = regulator_get(cm->dev, - charger->regulator_name); - if (IS_ERR(charger->consumer)) { - dev_err(cm->dev, "Cannot find charger(%s)\n", - charger->regulator_name); - return PTR_ERR(charger->consumer); - } - charger->cm = cm; - for (j = 0; j < charger->num_cables; j++) { struct charger_cable *cable = &charger->cables[j]; @@ -1580,13 +1594,23 @@ static int charger_manager_probe(struct platform_device *pdev) } psy_cfg.attr_grp = desc->sysfs_groups; + /* + * Acquire charger regulators before exposing the sysfs entries, so + * userspace cannot reach externally_control before the regulators + * (and charger->cm) are available. Mirrors the order in remove(). + */ + ret = charger_manager_get_regulators(cm); + if (ret < 0) + return ret; + cm->charger_psy = power_supply_register(&pdev->dev, &cm->charger_psy_desc, &psy_cfg); if (IS_ERR(cm->charger_psy)) { dev_err(&pdev->dev, "Cannot register charger-manager with name \"%s\"\n", cm->charger_psy_desc.name); - return PTR_ERR(cm->charger_psy); + ret = PTR_ERR(cm->charger_psy); + goto err_regulator; } /* Register extcon device for charger cable */ @@ -1620,11 +1644,11 @@ static int charger_manager_probe(struct platform_device *pdev) return 0; err_reg_extcon: + power_supply_unregister(cm->charger_psy); +err_regulator: for (i = 0; i < desc->num_charger_regulators; i++) regulator_put(desc->charger_regulators[i].consumer); - power_supply_unregister(cm->charger_psy); - return ret; } @@ -1642,12 +1666,12 @@ static void charger_manager_remove(struct platform_device *pdev) cancel_work_sync(&setup_polling); cancel_delayed_work_sync(&cm_monitor_work); - for (i = 0 ; i < desc->num_charger_regulators ; i++) - regulator_put(desc->charger_regulators[i].consumer); + try_charger_enable(cm, false); power_supply_unregister(cm->charger_psy); - try_charger_enable(cm, false); + for (i = 0 ; i < desc->num_charger_regulators ; i++) + regulator_put(desc->charger_regulators[i].consumer); } static const struct platform_device_id charger_manager_id[] = {