linux-kernel - Re: [PATCH] memstick: mark expected switch fall-throughs

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Message-ID: <CAGXu5jKdYiMtnO3wbOwCv2fy0PmvCBSLF8ANpBzBg057zaenRg@mail.gmail.com>
Date:   Tue, 23 Apr 2019 08:15:47 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Alex Dubov <oakad@...oo.com>, LKML <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] memstick: mark expected switch fall-throughs

On Tue, Feb 12, 2019 at 6:57 PM 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/memstick/host/jmb38x_ms.c: In function ‘jmb38x_ms_write_data’:
> drivers/memstick/host/jmb38x_ms.c:261:15: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    host->io_pos++;
>    ~~~~~~~~~~~~^~
> drivers/memstick/host/jmb38x_ms.c:262:2: note: here
>   case 2:
>   ^~~~
> drivers/memstick/host/jmb38x_ms.c:264:15: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    host->io_pos++;
>    ~~~~~~~~~~~~^~
> drivers/memstick/host/jmb38x_ms.c:265:2: note: here
>   case 1:
>   ^~~~
> drivers/memstick/host/tifm_ms.c: In function ‘tifm_ms_write_data’:
> drivers/memstick/host/tifm_ms.c:168:15: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    host->io_pos++;
>    ~~~~~~~~~~~~^~
> drivers/memstick/host/tifm_ms.c:169:2: note: here
>   case 2:
>   ^~~~
> drivers/memstick/host/tifm_ms.c:171:15: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    host->io_pos++;
>    ~~~~~~~~~~~~^~
> drivers/memstick/host/tifm_ms.c:172:2: note: here
>   case 1:
>   ^~~~
>
> 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>

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

-Kees

> ---
>  drivers/memstick/host/jmb38x_ms.c | 2 ++
>  drivers/memstick/host/tifm_ms.c   | 2 ++
>  2 files changed, 4 insertions(+)
>
> diff --git a/drivers/memstick/host/jmb38x_ms.c b/drivers/memstick/host/jmb38x_ms.c
> index bcdca9fbef51..49c71f55489f 100644
> --- a/drivers/memstick/host/jmb38x_ms.c
> +++ b/drivers/memstick/host/jmb38x_ms.c
> @@ -259,9 +259,11 @@ static unsigned int jmb38x_ms_write_data(struct jmb38x_ms_host *host,
>         case 3:
>                 host->io_word[0] |= buf[off + 2] << 16;
>                 host->io_pos++;
> +               /* fall through */
>         case 2:
>                 host->io_word[0] |= buf[off + 1] << 8;
>                 host->io_pos++;
> +               /* fall through */
>         case 1:
>                 host->io_word[0] |= buf[off];
>                 host->io_pos++;
> diff --git a/drivers/memstick/host/tifm_ms.c b/drivers/memstick/host/tifm_ms.c
> index bed205849d02..1bbb2ead9556 100644
> --- a/drivers/memstick/host/tifm_ms.c
> +++ b/drivers/memstick/host/tifm_ms.c
> @@ -166,9 +166,11 @@ static unsigned int tifm_ms_write_data(struct tifm_ms *host,
>         case 3:
>                 host->io_word |= buf[off + 2] << 16;
>                 host->io_pos++;
> +               /* fall through */
>         case 2:
>                 host->io_word |= buf[off + 1] << 8;
>                 host->io_pos++;
> +               /* fall through */
>         case 1:
>                 host->io_word |= buf[off];
>                 host->io_pos++;
> --
> 2.20.1
>


-- 
Kees Cook