linux-kernel - Re: [PATCH] mei: remove dev_err message on an unsupported ioctl

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Message-ID: <20180227181005.GA19944@kroah.com>
Date:   Tue, 27 Feb 2018 19:10:05 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     "Winkler, Tomas" <tomas.winkler@...el.com>
Cc:     Colin King <colin.king@...onical.com>,
        Arnd Bergmann <arnd@...db.de>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mei: remove dev_err message on an unsupported ioctl

On Tue, Feb 27, 2018 at 05:26:22PM +0000, Winkler, Tomas wrote:
> > 
> > From: Colin Ian King <colin.king@...onical.com>
> > 
> > Currently the driver spams the kernel log on unsupported ioctls which is
> > unnecessary as the ioctl returns -ENOIOCTLCMD to indicate this anyway.
> > I suspect this was originally for debugging purposes but it really is not
> > required so remove it.
> >
> 
> This is rather strange as most of the legimit applications are using one IOCTL from kernel 3.0
> Do you have any reference where this call is originated from, frankly this is the first time I got such complain.
> 
> In any case it would be maybe better to change it a warn once call.

Just drop the message, it should not be this easy for userspace to spam
the kernel log.  The patch looks fine to me.

thanks,

greg k-h