netdev - Re: [PATCH -next] net: hns3: replace snprintf with scnprintf in hns3_update

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Message-ID: <e7ae2607-1464-2268-03f7-244d6a2f2f43@huawei.com>
Date:   Mon, 20 Jan 2020 10:38:30 +0800
From:   Chen Zhou <chenzhou10@...wei.com>
To:     tanhuazhong <tanhuazhong@...wei.com>, <yisen.zhuang@...wei.com>,
        <salil.mehta@...wei.com>, <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] net: hns3: replace snprintf with scnprintf in
 hns3_update_strings



On 2020/1/20 9:27, tanhuazhong wrote:
> 
> 
> On 2020/1/19 20:40, Chen Zhou wrote:
>> snprintf returns the number of bytes that would be written, which may be
>> greater than the the actual length to be written. Here use extra code to
>> handle this.
>>
>> scnprintf returns the number of bytes that was actually written, just use
>> scnprintf to simplify the code.
>>
>> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
>> ---
>>   drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c | 3 +--
>>   1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
>> index 6e0212b..fa01888 100644
>> --- a/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
>> +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c
>> @@ -423,9 +423,8 @@ static void *hns3_update_strings(u8 *data, const struct hns3_stats *stats,
>>               data[ETH_GSTRING_LEN - 1] = '\0';
>>                 /* first, prepend the prefix string */
>> -            n1 = snprintf(data, MAX_PREFIX_SIZE, "%s%d_",
>> +            n1 = scnprintf(data, MAX_PREFIX_SIZE, "%s%d_",
>>                         prefix, i);
> 
> not align?

Ok, I will fix it in next version.

Thanks,
Chen Zhou

> 
>> -            n1 = min_t(uint, n1, MAX_PREFIX_SIZE - 1);
>>               size_left = (ETH_GSTRING_LEN - 1) - n1;
>>                 /* now, concatenate the stats string to it */
>>
> 
> 
> .
>