Re: [PATCH] watchdog: sc1200: Mark expected switch fall-through

[Guenter Roeck <linux@xxxxxxxxxxxx>]

On 2/14/19 12:20 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 warning:
>
> drivers/watchdog/sc1200wdt.c: In function ‘sc1200wdt_ioctl’:
> drivers/watchdog/sc1200wdt.c:241:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
>     sc1200wdt_write_data(WDTO, timeout);
>     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/watchdog/sc1200wdt.c:244:2: note: here
>    case WDIOC_GETTIMEOUT:
>    ^~~~
>
> Warning level 3 was used: -Wimplicit-fallthrough=3
>
> Notice that, in this particular case, the code comment is modified
> in accordance with what GCC is expecting to find.
>
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
>
> Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>

Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>

> ---
>   drivers/watchdog/sc1200wdt.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/sc1200wdt.c b/drivers/watchdog/sc1200wdt.c
> index 8e4e2fc13f87..e035a4d4b299 100644
> --- a/drivers/watchdog/sc1200wdt.c
> +++ b/drivers/watchdog/sc1200wdt.c
> @@ -239,7 +239,7 @@ static long sc1200wdt_ioctl(struct file *file, unsigned int cmd,
>   			return -EINVAL;
>   		timeout = new_timeout;
>   		sc1200wdt_write_data(WDTO, timeout);
> -		/* fall through and return the new timeout */
> +		/* fall through - and return the new timeout */
>   
>   	case WDIOC_GETTIMEOUT:
>   		return put_user(timeout * 60, p);