linux-kernel - Re: [PATCH] arcnet: com90io: Mark expected switch fall-throughs

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Message-ID: <201907290900.80C6D551@keescook>
Date:   Mon, 29 Jul 2019 09:00:07 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Michael Grzeschik <m.grzeschik@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] arcnet: com90io: Mark expected switch fall-throughs

On Mon, Jul 29, 2019 at 06:13:20AM -0500, Gustavo A. R. Silva wrote:
> Mark switch cases where we are expecting to fall through.
> 
> This patch fixes the following warnings (Building: powerpc allyesconfig):
> 
> drivers/net/arcnet/com90io.c: In function 'com90io_setup':
> include/linux/printk.h:304:2: warning: this statement may fall through [-Wimplicit-fallthrough=]
>   printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
>   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/net/arcnet/com90io.c:365:3: note: in expansion of macro 'pr_err'
>    pr_err("Too many arguments\n");
>    ^~~~~~
> drivers/net/arcnet/com90io.c:366:2: note: here
>   case 2:  /* IRQ */
>   ^~~~
> drivers/net/arcnet/com90io.c:367:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    irq = ints[2];
>    ~~~~^~~~~~~~~
> drivers/net/arcnet/com90io.c:368:2: note: here
>   case 1:  /* IO address */
>   ^~~~
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

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

-Kees

> ---
>  drivers/net/arcnet/com90io.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/arcnet/com90io.c b/drivers/net/arcnet/com90io.c
> index 2c546013a980..186bbf87bc84 100644
> --- a/drivers/net/arcnet/com90io.c
> +++ b/drivers/net/arcnet/com90io.c
> @@ -363,8 +363,10 @@ static int __init com90io_setup(char *s)
>  	switch (ints[0]) {
>  	default:		/* ERROR */
>  		pr_err("Too many arguments\n");
> +		/* Fall through */
>  	case 2:		/* IRQ */
>  		irq = ints[2];
> +		/* Fall through */
>  	case 1:		/* IO address */
>  		io = ints[1];
>  	}
> -- 
> 2.22.0
> 

-- 
Kees Cook