From 3e7a1ebc32fad5a558254a478efd401c17a24381 Mon Sep 17 00:00:00 2001 From: Fan Wu Date: Thu, 23 Jul 2026 22:53:10 +0000 Subject: [PATCH] power: supply: rt9455: quiesce delayed work before teardown The threaded IRQ handler can queue pwr_rdy_work, max_charging_time_work and batt_presence_work. pwr_rdy_work and batt_presence_work can also queue max_charging_time_work, while batt_presence_work can requeue itself. rt9455_remove() cancels max_charging_time_work before batt_presence_work. The latter can therefore queue max_charging_time_work after it has already been cancelled: rt9455_remove() workqueue cancel pwr_rdy_work cancel max_charging_time_work batt_presence_work queues max_charging_time_work cancel batt_presence_work return devres frees rt9455_info max_charging_time_work dereferences rt9455_info The IRQ also remains registered until devres cleanup and can queue more work after any of the cancellation calls. If rt9455_hw_init() fails after the IRQ has been requested, probe returns without cancelling work that may already have been queued. A pending callback can then access rt9455_info after it has been freed. Register rt9455_cancel_all_delayed_works() through devm_add_action_or_reset() right after devm_power_supply_register(). devres invokes the action in reverse registration order, after the managed IRQ has been freed and before rt9455_info is released, so the delayed works are drained in both rt9455_remove() and the probe error path. Cancel pwr_rdy_work and batt_presence_work before max_charging_time_work because both can queue the latter. This issue was found by an in-house static analysis tool. Fixes: e86d69dd786e ("power_supply: Add support for Richtek RT9455 battery charger") Cc: stable@vger.kernel.org Assisted-by: Codex:gpt-5.6 Signed-off-by: Fan Wu Link: https://patch.msgid.link/20260723225310.12663-1-fanwu01@zju.edu.cn Signed-off-by: Sebastian Reichel --- drivers/power/supply/rt9455_charger.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/power/supply/rt9455_charger.c b/drivers/power/supply/rt9455_charger.c index 4f3a799db654..313a7371211e 100644 --- a/drivers/power/supply/rt9455_charger.c +++ b/drivers/power/supply/rt9455_charger.c @@ -1582,6 +1582,19 @@ static const struct regmap_config rt9455_regmap_config = { .cache_type = REGCACHE_MAPLE, }; +static void rt9455_cancel_all_delayed_works(void *data) +{ + struct rt9455_info *info = data; + + /* + * Both pwr_rdy_work and batt_presence_work can queue + * max_charging_time_work, so cancel them first. + */ + cancel_delayed_work_sync(&info->pwr_rdy_work); + cancel_delayed_work_sync(&info->batt_presence_work); + cancel_delayed_work_sync(&info->max_charging_time_work); +} + static int rt9455_probe(struct i2c_client *client) { struct i2c_adapter *adapter = client->adapter; @@ -1672,6 +1685,10 @@ static int rt9455_probe(struct i2c_client *client) goto put_usb_notifier; } + ret = devm_add_action_or_reset(dev, rt9455_cancel_all_delayed_works, info); + if (ret) + goto put_usb_notifier; + ret = devm_request_threaded_irq(dev, client->irq, NULL, rt9455_irq_handler_thread, IRQF_TRIGGER_LOW | IRQF_ONESHOT, @@ -1710,10 +1727,6 @@ static void rt9455_remove(struct i2c_client *client) if (info->nb.notifier_call) usb_unregister_notifier(info->usb_phy, &info->nb); #endif - - cancel_delayed_work_sync(&info->pwr_rdy_work); - cancel_delayed_work_sync(&info->max_charging_time_work); - cancel_delayed_work_sync(&info->batt_presence_work); } static const struct i2c_device_id rt9455_i2c_id_table[] = {