Re: [PATCH] watchdog: riowd: Mark expected switch fall-through

[Guenter Roeck <linux@roeck-us.net>]

On Mon, Jul 29, 2019 at 08:46:50PM -0500, Gustavo A. R. Silva wrote:
> Mark switch cases where we are expecting to fall through.
> 
> This patch fixes the following warnings (Building: sparc64):
> 
> drivers/watchdog/riowd.c: In function ‘riowd_ioctl’:
> drivers/watchdog/riowd.c:136:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    riowd_writereg(p, riowd_timeout, WDTO_INDEX);
>    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/watchdog/riowd.c:139:2: note: here
>   case WDIOC_GETTIMEOUT:
>   ^~~~
> 
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
> Reviewed-by: Kees Cook <keescook@chromium.org>

Reviewed-by: Guenter Roeck <linux@roeck-us.net>

> ---
>  drivers/watchdog/riowd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/riowd.c b/drivers/watchdog/riowd.c
> index 41a2a11535a6..b35f7be20c00 100644
> --- a/drivers/watchdog/riowd.c
> +++ b/drivers/watchdog/riowd.c
> @@ -134,7 +134,7 @@ static long riowd_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  			return -EINVAL;
>  		riowd_timeout = (new_margin + 59) / 60;
>  		riowd_writereg(p, riowd_timeout, WDTO_INDEX);
> -		/* Fall */
> +		/* Fall through */
>  
>  	case WDIOC_GETTIMEOUT:
>  		return put_user(riowd_timeout * 60, (int __user *)argp);