linux-kernel - Re: [PATCH] HID: wacom_sys: add error code check in wacom_feature

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Message-ID: <26575f23-2ccb-98b8-df85-af829460ffd1@nfschina.com>
Date:   Mon, 6 Nov 2023 13:50:09 +0800
From:   Su Hui <suhui@...china.com>
To:     Rahul Rameshbabu <sergeantsagara@...tonmail.com>
Cc:     ping.cheng@...om.com, jason.gerecke@...om.com, jikos@...nel.org,
        benjamin.tissoires@...hat.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] HID: wacom_sys: add error code check in
 wacom_feature_mapping

On 2023/11/6 11:57, Rahul Rameshbabu wrote:
> On Fri, 20 Oct, 2023 17:02:38 +0800 "Su Hui" <suhui@...china.com> wrote:
>> hid_report_raw_event() can return error code like '-ENOMEM' if
>> failed, so check 'ret' to make sure all things work fine.
> I can agree with adding logging for error cases personally.
>
>> Signed-off-by: Su Hui <suhui@...china.com>
>> ---
>>   drivers/hid/wacom_sys.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
>> index 3f704b8072e8..1f898d4ee708 100644
>> --- a/drivers/hid/wacom_sys.c
>> +++ b/drivers/hid/wacom_sys.c
>> @@ -320,6 +320,8 @@ static void wacom_feature_mapping(struct hid_device *hdev,
>>   			if (ret == n && features->type == HID_GENERIC) {
>>   				ret = hid_report_raw_event(hdev,
>>   					HID_FEATURE_REPORT, data, n, 0);
>> +				if (ret)
>> +					hid_warn(hdev, "failed to report feature\n");
> I think we should report the returned error information as well.
Agreed, I will send v2 soon.
Thanks for your suggestions!

Su Hui

>
>    https://docs.kernel.org/core-api/printk-formats.html#error-pointers
>
> Typically what I do is use ERR_PTR in tandem with the %pe modifier for
> printing errors.
>
>>   			} else if (ret == 2 && features->type != HID_GENERIC) {
>>   				features->touch_max = data[1];
>>   			} else {
>> @@ -381,6 +383,8 @@ static void wacom_feature_mapping(struct hid_device *hdev,
>>   		if (ret == n) {
>>   			ret = hid_report_raw_event(hdev, HID_FEATURE_REPORT,
>>   						   data, n, 0);
>> +			if (ret)
>> +				hid_warn(hdev, "failed to report feature\n");
>>   		} else {
>>   			hid_warn(hdev, "%s: could not retrieve sensor offsets\n",
>>   				 __func__);
> --
> Thanks for the patch,
>
> Rahul Rameshbabu
>