linux-kernel - Re: [PATCH] mtd: lpddr_cmds: Mark expected switch fall-through

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Message-ID: <CAGXu5j+_CGq=69qAaZz1zYpHx-khRT+VSLtARkU+8txBkdzk2A@mail.gmail.com>
Date:   Wed, 10 Apr 2019 14:47:05 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        Linux mtd <linux-mtd@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: lpddr_cmds: Mark expected switch fall-through

On Fri, Feb 8, 2019 at 10:12 AM Gustavo A. R. Silva
<gustavo@...eddedor.com> wrote:
>
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
>
> This patch fixes the following warnings:
>
> drivers/mtd/lpddr/lpddr_cmds.c: In function ‘chip_ready’:
> drivers/mtd/lpddr/lpddr_cmds.c:319:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    if (mode == FL_READY && chip->oldstate == FL_READY)
>       ^
> drivers/mtd/lpddr/lpddr_cmds.c:322:2: note: here
>   default:
>   ^~~~~~~
>
> Warning level 3 was used: -Wimplicit-fallthrough=3
>
> This patch is part of the ongoing efforts to enabling
> -Wimplicit-fallthrough.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
>  drivers/mtd/lpddr/lpddr_cmds.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/mtd/lpddr/lpddr_cmds.c b/drivers/mtd/lpddr/lpddr_cmds.c
> index b13557fe52bd..76a4c73e100e 100644
> --- a/drivers/mtd/lpddr/lpddr_cmds.c
> +++ b/drivers/mtd/lpddr/lpddr_cmds.c
> @@ -318,6 +318,7 @@ static int chip_ready(struct map_info *map, struct flchip *chip, int mode)
>                 /* Only if there's no operation suspended... */
>                 if (mode == FL_READY && chip->oldstate == FL_READY)
>                         return 0;
> +               /* fall through */
>
>         default:
>  sleep:
> --
> 2.20.1
>


-- 
Kees Cook