linux-kernel - 回复: [PATCH] usb: replace snprintf in show functions with sysfs

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Message-ID: <SL2PR06MB3082C1AAF2A11871C10CDA53BDB79@SL2PR06MB3082.apcprd06.prod.outlook.com>
Date:   Wed, 13 Oct 2021 06:52:53 +0000
From:   王擎 <wangqing@...o.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 回复: [PATCH] usb: replace snprintf in show functions with sysfs_emit

 
>> On Tue, Oct 12, 2021 at 08:27:47PM -0700, Qing Wang wrote:
>> coccicheck complains about the use of snprintf() in sysfs show functions.
>> 
>> Fix the following coccicheck warning:
>> drivers/usb/core/sysfs.c:730:8-16: WARNING: use scnprintf or sprintf.
>> drivers/usb/core/sysfs.c:921:8-16: WARNING: use scnprintf or sprintf.
>> 
>> Use sysfs_emit instead of scnprintf or sprintf makes more sense.
>> 
>> Signed-off-by: Qing Wang <wangqing@...o.com>
>> ---
>>  drivers/usb/core/sysfs.c | 4 ++--
>>  1 file changed, 2 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
>> index fa2e49d..6387c0d 100644
>> --- a/drivers/usb/core/sysfs.c
>> +++ b/drivers/usb/core/sysfs.c
>> @@ -727,7 +727,7 @@ static ssize_t authorized_show(struct device *dev,
>>                               struct device_attribute *attr, char *buf)
>>  {
>>        struct usb_device *usb_dev = to_usb_device(dev);
>> -     return snprintf(buf, PAGE_SIZE, "%u\n", usb_dev->authorized);
>> +     return sysfs_emit(buf, "%u\n", usb_dev->authorized);
>>  }
>>  
>>  /*
>> @@ -918,7 +918,7 @@ static ssize_t authorized_default_show(struct device *dev,
>>        struct usb_hcd *hcd;
>>  
>>        hcd = bus_to_hcd(usb_bus);
>> -     return snprintf(buf, PAGE_SIZE, "%u\n", hcd->dev_policy);
>> +     return sysfs_emit(buf, "%u\n", hcd->dev_policy);
>>  }
>>  
>>  static ssize_t authorized_default_store(struct device *dev,
>> -- 
>> 2.7.4
>> 
> 
> If you are going to change this file, you should do this for all of the
> sysfs show functions in this file, not just 2 of them, right?  Please
> change this patch to do that.
>
> thanks,
> 
> greg k-h

Only these 2 snprintf need to be modified, other show functions
used sprintf do not need to modify.

Thanks,

Qing