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From:   Richard Weinberger <richard@nod.at>
To:     Quentin Schulz <quentin.schulz@bootlin.com>
Cc:     dedekind1@gmail.com, dwmw2@infradead.org,
        computersforpeace@gmail.com, boris.brezillon@bootlin.com,
        marek.vasut@gmail.com, linux-mtd@lists.infradead.org,
        linux-kernel@vger.kernel.org, thomas.petazzoni@bootlin.com
Subject: Re: [PATCH v3 2/2] ubi: expose the volume CRC check skip flag
Date:   Sun, 01 Jul 2018 21:35:57 +0200
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Quentin,

Am Donnerstag, 28. Juni 2018, 09:40:53 CEST schrieb Quentin Schulz:
> Now that we have the logic for skipping CRC check for static UBI volumes
> in the core, let's expose it to users.
> 
> This makes use of a padding byte in the volume description data
> structure as a flag. This flag only tell for now whether we should skip
> the CRC check of a volume.
> 
> This checks the UBI volume for which we are trying to skip the CRC check
> is static.
> 
> Suggested-by: Boris Brezillon <boris.brezillon@bootlin.com>
> Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
> Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
> ---
>  drivers/mtd/ubi/cdev.c      |  4 ++++
>  drivers/mtd/ubi/vmt.c       |  3 +++
>  include/uapi/mtd/ubi-user.h | 16 ++++++++++++++--
>  3 files changed, 21 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
> index 45c3296..3eea1df 100644
> --- a/drivers/mtd/ubi/cdev.c
> +++ b/drivers/mtd/ubi/cdev.c
> @@ -622,6 +622,10 @@ static int verify_mkvol_req(const struct ubi_device *ubi,
>  	    req->vol_type != UBI_STATIC_VOLUME)
>  		goto bad;
>  
> +	if (req->flags & UBI_VOL_SKIP_CRC_CHECK_FLG &&
> +	    req->vol_type != UBI_STATIC_VOLUME)
> +		goto bad;

We should also reject unknown flags here.

Thanks,
//richard