Re: [PATCH] mtd: onenand_base: Mark expected switch fall-through

[Kees Cook]

On Tue, Jun 04, 2019 at 09:17:37AM -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/mtd/nand/onenand/onenand_base.c: In function âonenand_check_featuresâ:
> drivers/mtd/nand/onenand/onenand_base.c:3264:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    this->options |= ONENAND_HAS_NOP_1;
> drivers/mtd/nand/onenand/onenand_base.c:3265:2: note: here
>   case ONENAND_DEVICE_DENSITY_4Gb:
>   ^~~~
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
> 
> Cc: Jonathan Bakker <xc-racer2@xxxxxxx>
> Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>

-Kees

> ---
>  drivers/mtd/nand/onenand/onenand_base.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mtd/nand/onenand/onenand_base.c b/drivers/mtd/nand/onenand/onenand_base.c
> index ba46d0cf60a1..bdb5f4733d28 100644
> --- a/drivers/mtd/nand/onenand/onenand_base.c
> +++ b/drivers/mtd/nand/onenand/onenand_base.c
> @@ -3262,6 +3262,7 @@ static void onenand_check_features(struct mtd_info *mtd)
>  	switch (density) {
>  	case ONENAND_DEVICE_DENSITY_8Gb:
>  		this->options |= ONENAND_HAS_NOP_1;
> +		/* fall through */
>  	case ONENAND_DEVICE_DENSITY_4Gb:
>  		if (ONENAND_IS_DDP(this))
>  			this->options |= ONENAND_HAS_2PLANE;
> -- 
> 2.21.0
> 

-- 
Kees Cook