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

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Message-ID: <9dfec9a9-1a20-f6ab-5773-d7ee03343036@embeddedor.com>
Date:   Wed, 20 Mar 2019 12:40:37 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Alex Dubov <oakad@...oo.com>
Cc:     linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] memstick: mark expected switch fall-throughs

Hi,

Friendly ping:

Who can take this?

Thanks
--
Gustavo

On 2/12/19 8:57 PM, 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 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>
> ---
>  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++;
>