Re: [PATCH v2] mtd: onenand_base: Avoid fall-through warnings

From: Kees Cook <keescook@chromium.org>
To: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Cc: Vignesh Raghavendra <vigneshr@ti.com>,
	Richard Weinberger <richard@nod.at>,
	linux-kernel@vger.kernel.org, Marek Vasut <marek.vasut@gmail.com>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	linux-mtd@lists.infradead.org,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Brian Norris <computersforpeace@gmail.com>,
	David Woodhouse <dwmw2@infradead.org>
Subject: Re: [PATCH v2] mtd: onenand_base: Avoid fall-through warnings
Date: Thu, 23 May 2019 13:17:25 -0700	[thread overview]
Message-ID: <201905231316.97C0BBF15@keescook> (raw)
In-Reply-To: <20190523191606.GA9838@embeddedor>

On Thu, May 23, 2019 at 02:16:06PM -0500, Gustavo A. R. Silva wrote:
> NOTICE THAT:
> 
> "...we don't know whether we need fallthroughs or breaks here and this
> is just a change to avoid having new warnings when switching to
> -Wimplicit-fallthrough but this change might be entirely wrong."[1]
> 
> See the original thread of discussion here:
> 
> https://lore.kernel.org/patchwork/patch/1036251/
> 
> So, in preparation to enabling -Wimplicit-fallthrough, this patch silences
> the following warnings:
> 
> drivers/mtd/nand/onenand/onenand_base.c: In function ‘onenand_check_features’:
> drivers/mtd/nand/onenand/onenand_base.c:3264:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    if (ONENAND_IS_DDP(this))
>       ^
> drivers/mtd/nand/onenand/onenand_base.c:3284:2: note: here
>   case ONENAND_DEVICE_DENSITY_2Gb:
>   ^~~~
> drivers/mtd/nand/onenand/onenand_base.c:3288:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
>    this->options |= ONENAND_HAS_UNLOCK_ALL;
> drivers/mtd/nand/onenand/onenand_base.c:3290:2: note: here
>   case ONENAND_DEVICE_DENSITY_1Gb:
>   ^~~~
> 
> Warning level 3 was used: -Wimplicit-fallthrough=3
> 
> Also, notice that this patch doesn't change any functionality. See the
> most recent thread of discussion here:
> 
> https://lore.kernel.org/patchwork/patch/1077395/
> 
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
> 
> [1] https://lore.kernel.org/lkml/20190509085318.34a9d4be@xps13/
> 
> Cc: Miquel Raynal <miquel.raynal@bootlin.com>
> Suggested-by: Boris Brezillon <boris.brezillon@collabora.com>
> Suggested-by: Kees Cook <keescook@chromium.org>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

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

Thanks for updating this!

> ---
> Changes in v2:
>  - Add breaks instead of fall-through markings without altering any
>    functionality.
>  - Update changelog text.
> 
>  drivers/mtd/nand/onenand/onenand_base.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/mtd/nand/onenand/onenand_base.c b/drivers/mtd/nand/onenand/onenand_base.c
> index f41d76248550..fd0da5c347db 100644
> --- a/drivers/mtd/nand/onenand/onenand_base.c
> +++ b/drivers/mtd/nand/onenand/onenand_base.c
> @@ -3280,12 +3280,15 @@ static void onenand_check_features(struct mtd_info *mtd)
>  			if ((this->version_id & 0xf) == 0xe)
>  				this->options |= ONENAND_HAS_NOP_1;
>  		}
> +		this->options |= ONENAND_HAS_UNLOCK_ALL;
> +		break;
>  
>  	case ONENAND_DEVICE_DENSITY_2Gb:
>  		/* 2Gb DDP does not have 2 plane */
>  		if (!ONENAND_IS_DDP(this))
>  			this->options |= ONENAND_HAS_2PLANE;
>  		this->options |= ONENAND_HAS_UNLOCK_ALL;
> +		break;
>  
>  	case ONENAND_DEVICE_DENSITY_1Gb:
>  		/* A-Die has all block unlock */
> -- 
> 2.21.0
> 

-- 
Kees Cook

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