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

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Date:   Wed, 13 Oct 2021 08:19:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Qing Wang <wangqing@...o.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [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