[PATCH v2] platform: x86: huawei-wmi: check the return value of device_create_file()

From: Jia-Ju Bai
Date: Wed Mar 02 2022 - 21:24:40 EST


The function device_create_file() in huawei_wmi_battery_add() can fail,
so its return value should be checked.

Fixes: 355a070b09ab ("platform/x86: huawei-wmi: Add battery charging thresholds")
Reported-by: TOTE Robot <oslab@xxxxxxxxxxxxxxx>
Signed-off-by: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
---
v2:
* Fix the code format.
Thank Hans for good advice.

---
drivers/platform/x86/huawei-wmi.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c
index a2d846c4a7ee..eac3e6b4ea11 100644
--- a/drivers/platform/x86/huawei-wmi.c
+++ b/drivers/platform/x86/huawei-wmi.c
@@ -470,10 +470,17 @@ static DEVICE_ATTR_RW(charge_control_thresholds);

static int huawei_wmi_battery_add(struct power_supply *battery)
{
- device_create_file(&battery->dev, &dev_attr_charge_control_start_threshold);
- device_create_file(&battery->dev, &dev_attr_charge_control_end_threshold);
+ int err = 0;

- return 0;
+ err = device_create_file(&battery->dev, &dev_attr_charge_control_start_threshold);
+ if (err)
+ return err;
+
+ err = device_create_file(&battery->dev, &dev_attr_charge_control_end_threshold);
+ if (err)
+ device_remove_file(&battery->dev, &dev_attr_charge_control_start_threshold);
+
+ return err;
}

static int huawei_wmi_battery_remove(struct power_supply *battery)
--
2.17.1