linux-kernel - Re: [PATCH] usb: phy: ab8500-usb: Mark expected switch fall-throughs

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Message-ID: <CAOesGMh=H8MnZYH7xUFjF4rGWTt+cdkOGfDG4gr=Uaa1mU8A+A@mail.gmail.com>
Date:   Fri, 13 Sep 2019 19:00:04 +0100
From:   Olof Johansson <olof@...om.net>
To:     Kees Cook <keescook@...omium.org>
Cc:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] usb: phy: ab8500-usb: Mark expected switch fall-throughs

On Mon, Jul 29, 2019 at 5:36 PM Kees Cook <keescook@...omium.org> wrote:
>
> On Sun, Jul 28, 2019 at 07:06:31PM -0500, Gustavo A. R. Silva wrote:
> > Mark switch cases where we are expecting to fall through.
> >
> > This patch fixes the following warnings:
> >
> > drivers/usb/phy/phy-ab8500-usb.c: In function 'ab8500_usb_link_status_update':
> > drivers/usb/phy/phy-ab8500-usb.c:424:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >    event = UX500_MUSB_RIDB;
> >    ~~~~~~^~~~~~~~~~~~~~~~~
> > drivers/usb/phy/phy-ab8500-usb.c:425:2: note: here
> >   case USB_LINK_NOT_CONFIGURED_8500:
> >   ^~~~
> > drivers/usb/phy/phy-ab8500-usb.c:440:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >    event = UX500_MUSB_RIDC;
> >    ~~~~~~^~~~~~~~~~~~~~~~~
> > drivers/usb/phy/phy-ab8500-usb.c:441:2: note: here
> >   case USB_LINK_STD_HOST_NC_8500:
> >   ^~~~
> > drivers/usb/phy/phy-ab8500-usb.c:459:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >    event = UX500_MUSB_RIDA;
> >    ~~~~~~^~~~~~~~~~~~~~~~~
> > drivers/usb/phy/phy-ab8500-usb.c:460:2: note: here
> >   case USB_LINK_HM_IDGND_8500:
> >   ^~~~
> > drivers/usb/phy/phy-ab8500-usb.c: In function 'ab8505_usb_link_status_update':
> > drivers/usb/phy/phy-ab8500-usb.c:332:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >    event = UX500_MUSB_RIDB;
> >    ~~~~~~^~~~~~~~~~~~~~~~~
> > drivers/usb/phy/phy-ab8500-usb.c:333:2: note: here
> >   case USB_LINK_NOT_CONFIGURED_8505:
> >   ^~~~
> > drivers/usb/phy/phy-ab8500-usb.c:352:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >    event = UX500_MUSB_RIDC;
> >    ~~~~~~^~~~~~~~~~~~~~~~~
> > drivers/usb/phy/phy-ab8500-usb.c:353:2: note: here
> >   case USB_LINK_STD_HOST_NC_8505:
> >   ^~~~
> > drivers/usb/phy/phy-ab8500-usb.c:370:9: warning: this statement may fall through [-Wimplicit-fallthrough=]
> >    event = UX500_MUSB_RIDA;
> >    ~~~~~~^~~~~~~~~~~~~~~~~
> > drivers/usb/phy/phy-ab8500-usb.c:371:2: note: here
> >   case USB_LINK_HM_IDGND_8505:
> >   ^~~~
> >
> > Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>
> Reviewed-by: Kees Cook <keescook@...omium.org>

Acked-by: Olof Johansson <olof@...om.net>

Felipe, Greg, this is still throwing warnings, several months later --
patch was never applied.

Mind picking it up as a fix to get a quieter build?


Thanks,

-Olof