linux-kernel - Re: [PATCH] HID: roccat: Mark expected switch fall-through

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Date:   Wed, 20 Feb 2019 09:15:17 +0100
From:   Stefan Achatz <stefan_achatz@....de>
To:     Jiri Kosina <jikos@...nel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Stefan Achatz <erazor_de@...rs.sourceforge.net>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] HID: roccat: Mark expected switch fall-through

Am Dienstag, den 19.02.2019, 14:16 +0100 schrieb Jiri Kosina:
> On Mon, 11 Feb 2019, Gustavo A. R. Silva wrote:
>
> > In preparation to enabling -Wimplicit-fallthrough, mark switch
> > cases where we are expecting to fall through.
> >
> > This patch fixes the following warning:
> >
> > drivers/hid/hid-roccat-kone.c: In function
> > ‘kone_keep_values_up_to_date’:
> > drivers/hid/hid-roccat-kone.c:784:20: warning: this statement may
> > fall through [-Wimplicit-fallthrough=]
> >    kone->actual_dpi = kone->profiles[event->value - 1].
> >    ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >      startup_dpi;
> >      ~~~~~~~~~~~
> > drivers/hid/hid-roccat-kone.c:786:2: note: here
> >   case kone_mouse_event_osd_profile:
> >   ^~~~
> >
> > Warning level 3 was used: -Wimplicit-fallthrough=3
> >
> > This patch is part of the ongoing efforts to enable
> > -Wimplicit-fallthrough.
> >
> > Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
> > ---
> >  drivers/hid/hid-roccat-kone.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/hid/hid-roccat-kone.c b/drivers/hid/hid-
> > roccat-kone.c
> > index bf4675a27396..c4dd6162c1d6 100644
> > --- a/drivers/hid/hid-roccat-kone.c
> > +++ b/drivers/hid/hid-roccat-kone.c
> > @@ -783,6 +783,7 @@ static void kone_keep_values_up_to_date(struct
> > kone_device *kone,
> >  	case kone_mouse_event_switch_profile:
> >  		kone->actual_dpi = kone->profiles[event->value -
> > 1].
> >  				startup_dpi;
> > +		/* fall through */
> >  	case kone_mouse_event_osd_profile:
> >  		kone->actual_profile = event->value;
> >  		break;
>
> Stefan, could you please confirm that this is intended behavior?
>
> Thanks,

I already confirmed this 7 months ago but as I see only in a reply to
you.
Yes, this patch is correct.
Stefan