linux-kernel - Re: [PATCH] Input: libps2 - mark expected switch fall-through

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Date:   Tue, 7 May 2019 12:27:44 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH] Input: libps2 - mark expected switch fall-through

On Tue, May 07, 2019 at 01:24:09PM -0500, 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/input/serio/libps2.c: In function ‘ps2_handle_ack’:
> drivers/input/serio/libps2.c:407:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    if (ps2dev->flags & PS2_FLAG_NAK) {
>       ^
> drivers/input/serio/libps2.c:417:2: note: here
>   case 0x00:
>   ^~~~
> 
> 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>

Applied, thank you.

> ---
>  drivers/input/serio/libps2.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c
> index e6a07e68d1ff..22b8e05aa36c 100644
> --- a/drivers/input/serio/libps2.c
> +++ b/drivers/input/serio/libps2.c
> @@ -409,6 +409,7 @@ bool ps2_handle_ack(struct ps2dev *ps2dev, u8 data)
>  			ps2dev->nak = PS2_RET_ERR;
>  			break;
>  		}
> +		/* Fall through */
>  
>  	/*
>  	 * Workaround for mice which don't ACK the Get ID command.
> -- 
> 2.21.0
> 

-- 
Dmitry