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Date: Thu, 15 Feb 2024 14:20:41 +0200
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Robin van der Gracht <robin@protonic.nl>,
	Paul Burton <paulburton@kernel.org>
Subject: Re: [PATCH v2 12/15] auxdisplay: ht16k33: Switch to use line display
 character mapping
Message-ID: <Zc4BmcVF-dEX4Mvo@smile.fi.intel.com>
References: <20240212170423.2860895-1-andriy.shevchenko@linux.intel.com>
 <20240212170423.2860895-13-andriy.shevchenko@linux.intel.com>
 <CAMuHMdUBMieOt8V03OzRXO84w6RTjnMDHwBr3RtAWc+v-cRUsA@mail.gmail.com>
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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@linux.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.

-- 
With Best Regards,
Andy Shevchenko