5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Zheng Wang zyytlz.wz@163.com
[ Upstream commit 47c29d69212911f50bdcdd0564b5999a559010d4 ]
In bq24190_probe, &bdi->input_current_limit_work is bound with bq24190_input_current_limit_work. When external power changed, it will call bq24190_charger_external_power_changed to start the work.
If we remove the module which will call bq24190_remove to make cleanup, there may be a unfinished work. The possible sequence is as follows:
CPU0 CPUc1
|bq24190_input_current_limit_work bq24190_remove | power_supply_unregister | device_unregister | power_supply_dev_release| kfree(psy) | | | power_supply_get_property_from_supplier | //use
Fix it by finishing the work before cleanup in the bq24190_remove
Fixes: 97774672573a ("power_supply: Initialize changed_work before calling device_add") Signed-off-by: Zheng Wang zyytlz.wz@163.com Signed-off-by: Sebastian Reichel sebastian.reichel@collabora.com Signed-off-by: Shubham Kulkarni skulkarni@mvista.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/power/supply/bq24190_charger.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/power/supply/bq24190_charger.c +++ b/drivers/power/supply/bq24190_charger.c @@ -1845,6 +1845,7 @@ static int bq24190_remove(struct i2c_cli struct bq24190_dev_info *bdi = i2c_get_clientdata(client); int error;
+ cancel_delayed_work_sync(&bdi->input_current_limit_work); error = pm_runtime_resume_and_get(bdi->dev); if (error < 0) dev_warn(bdi->dev, "pm_runtime_get failed: %i\n", error);