linux-kernel - RE: [char-misc-next 1/6] mei: use sprintf in tx_queue_limit

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Date:   Sat, 6 Feb 2021 14:58:43 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     "Usyskin, Alexander" <alexander.usyskin@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [char-misc-next 1/6] mei: use sprintf in tx_queue_limit_show
 sysfs


> On Sat, Feb 06, 2021 at 04:43:20PM +0200, Tomas Winkler wrote:
> > Using of snprintf is discouraged in sysfs.
> > For simple u8 it is safe to use sprintf.
> >
> > Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> > ---
> >  drivers/misc/mei/main.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c index
> > 9f6682033ed7..24a05f45b639 100644
> > --- a/drivers/misc/mei/main.c
> > +++ b/drivers/misc/mei/main.c
> > @@ -1026,7 +1026,7 @@ static ssize_t tx_queue_limit_show(struct device
> *device,
> >  	size = dev->tx_queue_limit;
> >  	mutex_unlock(&dev->device_lock);
> >
> > -	return snprintf(buf, PAGE_SIZE, "%u\n", size);
> > +	return sprintf(buf, "%u\n", size);
> 
> If you are going to do this, why not just convert it to use sysfs_emit()
> instead?

I thought it's an overkill, but if you prefer that I will resubmit. 

Thanks
Tomas