linux-kernel - Re: [PATCH 2/5] drm/modes: Extract drm_mode_parse_cmdline_named

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Message-ID: <CAMuHMdU4tmYfnc96SGKuvdKC_JGNOHUmmNwrN4DdOmw0LijPvA@mail.gmail.com>
Date:   Fri, 8 Jul 2022 22:14:06 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        "Linux/m68k" <linux-m68k@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] drm/modes: Extract drm_mode_parse_cmdline_named_mode()

Hi Hans,

On Fri, Jul 8, 2022 at 9:46 PM Hans de Goede <hdegoede@...hat.com> wrote:
> On 7/8/22 20:21, Geert Uytterhoeven wrote:
> > Extract the code to check for a named mode parameter into its own
> > function, to streamline the main parsing flow.
> >
> > Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

> > --- a/drivers/gpu/drm/drm_modes.c
> > +++ b/drivers/gpu/drm/drm_modes.c
> > @@ -1749,6 +1749,30 @@ static const char * const drm_named_modes_whitelist[] = {
> >       "PAL",
> >  };
> >
> > +static int drm_mode_parse_cmdline_named_mode(const char *name,
> > +                                          unsigned int length,
> > +                                          bool refresh,
> > +                                          struct drm_cmdline_mode *mode)
> > +{
> > +     unsigned int i;
> > +     int ret;
> > +
> > +     for (i = 0; i < ARRAY_SIZE(drm_named_modes_whitelist); i++) {
> > +             ret = str_has_prefix(name, drm_named_modes_whitelist[i]);
> > +             if (!ret)
>
> As discussed in my review of 1/5 this needs to become:
>
>                 if (ret != length)
> > +                     continue;

Agreed.

> Which renders my other comment on this patch (length not being used) mute.

/me wonders if he would have seen the light earlier if gcc would have
warned about that...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds