linux-kernel - Re: [PATCH v3 1/2] ubi: provide a way to skip CRC checks

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Date:   Mon, 02 Jul 2018 10:30:25 +0300
From:   Artem Bityutskiy <dedekind1@...il.com>
To:     Quentin Schulz <quentin.schulz@...tlin.com>, richard@....at,
        dwmw2@...radead.org, computersforpeace@...il.com,
        boris.brezillon@...tlin.com, marek.vasut@...il.com
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        thomas.petazzoni@...tlin.com
Subject: Re: [PATCH v3 1/2] ubi: provide a way to skip CRC checks

Hi,

On Thu, 2018-06-28 at 09:40 +0200, Quentin Schulz wrote:
> diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
> index d4b2e87..e9e9ecb 100644
> --- a/drivers/mtd/ubi/kapi.c
> +++ b/drivers/mtd/ubi/kapi.c
> @@ -202,7 +202,7 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
>  	desc->mode = mode;
>  
>  	mutex_lock(&ubi->ckvol_mutex);
> -	if (!vol->checked) {
> +	if (!vol->checked && !vol->skip_check) {
>  		/* This is the first open - check the volume */
>  		err = ubi_check_volume(ubi, vol_id);
>  		if (err < 0) {

Did you deliberately did not add a similar check to 'vol_cdev_write()' ?
You want to skip checking on load but do have the checking after volume update ?
Looks a bit inconsistent to me. At the very least deserves a comment in
'vol_cdev_write()' about why 'skip_check' flag is ignored there.