linux-hardening - Re: [PATCH 104/141] mtd: rawnand: stm32_fmc2: Fix fall-through warnings for Clang

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Message-ID: <20201123093347.719a77cf@xps13>
Date:   Mon, 23 Nov 2020 09:33:47 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-mtd@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 104/141] mtd: rawnand: stm32_fmc2: Fix fall-through
 warnings for Clang

Hi Gustavo,

"Gustavo A. R. Silva" <gustavoars@...nel.org> wrote on Fri, 20 Nov 2020
12:37:48 -0600:

> In preparation to enable -Wimplicit-fallthrough for Clang, fix a couple
> of warnings by explicitly adding a couple of fallthrough pseudo-keywords
> instead of letting the code fall through to the next case.
> 
> Link: https://github.com/KSPP/linux/issues/115
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>  drivers/mtd/nand/raw/stm32_fmc2_nand.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
> index 550bda4d1415..002fa521036f 100644
> --- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
> +++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
> @@ -531,6 +531,7 @@ static int stm32_fmc2_nfc_ham_correct(struct nand_chip *chip, u8 *dat,
>  		switch (b % 4) {
>  		case 2:
>  			bit_position += shifting;
> +			fallthrough;

In patch 100, 101, 102, 103 you 'break' in this case (when the
statement falls into the empty following statement which itself
breaks). Please make it consistent and use break here, below, and in
patch 132.

LGTM otherwise.

>  		case 1:
>  			break;
>  		default:
> @@ -546,6 +547,7 @@ static int stm32_fmc2_nfc_ham_correct(struct nand_chip *chip, u8 *dat,
>  		switch (b % 4) {
>  		case 2:
>  			byte_addr += shifting;
> +			fallthrough;
>  		case 1:
>  			break;
>  		default:

Thanks,
Miquèl