linux-kernel - Re: [PATCH v2 12/15] auxdisplay: ht16k33: Switch to use line display character mapping

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Date: Thu, 15 Feb 2024 13:31:11 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Robin van der Gracht <robin@...tonic.nl>, Paul Burton <paulburton@...nel.org>
Subject: Re: [PATCH v2 12/15] auxdisplay: ht16k33: Switch to use line display
 character mapping

On Thu, Feb 15, 2024 at 1:20 PM Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
>
> On Thu, Feb 15, 2024 at 09:16:05AM +0100, Geert Uytterhoeven wrote:
> > On Mon, Feb 12, 2024 at 6:04 PM Andy Shevchenko
> > <andriy.shevchenko@...ux.intel.com> wrote:
>
> ...
>
> > > +static int ht16k33_linedisp_get_map_type(struct linedisp *linedisp)
> > > +{
> > > +       struct ht16k33_priv *priv = container_of(linedisp, struct ht16k33_priv,
> > > +                                                seg.linedisp);
> > > +
> > > +       switch (priv->type) {
> > > +       case DISP_MATRIX:
> > > +               /* not handled here */
> > > +               return -EINVAL;
> > > +
> > > +       case DISP_QUAD_7SEG:
> > > +               INIT_DELAYED_WORK(&priv->work, ht16k33_seg7_update);
> > > +               return LINEDISP_MAP_SEG7;
> > > +
> > > +       case DISP_QUAD_14SEG:
> > > +               INIT_DELAYED_WORK(&priv->work, ht16k33_seg14_update);
> > > +               return LINEDISP_MAP_SEG14;
> > > +       }
> >
> > error: control reaches end of non-void function [-Werror=return-type]
> >
> > Missing "return -EINVAL";
> >
> > This case cannot happen, so it wasn't handled in the old code.
> > But with the new code, it fails at compile-time.
>
> What is the command line and compiler you are using?
> I have compiled this code without issues.

riscv64-linux-gnu-gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04)
aarch64-linux-gnu-gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04)

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

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