linux-kernel - Re: [patch v2 2/3] staging: speakup: check and convert dev name or ser to dev

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Date:   Sun, 18 Jun 2017 22:33:35 -0700
From:   Joe Perches <joe@...ches.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Okash Khawaja <okash.khawaja@...il.com>
Cc:     Jiri Slaby <jslaby@...e.com>,
        Samuel Thibault <samuel.thibault@...-lyon.org>,
        linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
        Kirk Reiser <kirk@...sers.ca>, speakup@...ux-speakup.org,
        Chris Brannon <chris@...-brannons.com>
Subject: Re: [patch v2 2/3] staging: speakup: check and convert dev name or
 ser to dev_t

On Mon, 2017-06-19 at 09:15 +0800, Greg Kroah-Hartman wrote:
> On Sun, Jun 18, 2017 at 09:58:27AM +0100, Okash Khawaja wrote:
> > This patch adds functionality to validate and convert either a device
> > name or 'ser' member of synth into dev_t.
[]
> > --- a/drivers/staging/speakup/spk_ttyio.c
[]
> > +int ser_to_dev(int ser, dev_t *dev_no)
> > +{
> > +	if (ser < 0 || ser > (255 - 64)) {
> > +                pr_err("speakup: Invalid ser param. \
> > +				Must be between 0 and 191 inclusive.\n");
> 
> As Andy pointed out, never do this for a C string, it's not doing what
> you think it is :)

Well, some guy.

> Worse case, do this like the following:
> 		pr_err("speakup: Invalid ser param."
> 			"Must be between 0 and 191 inclusive.\n");

Nope, now there's no space between param and Must.

Using string concatenation on multiple lines is error prone.