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Message-ID: <20200218114537.723436b3@xps13>
Date: Tue, 18 Feb 2020 11:45:53 +0100
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Piotr Sroka <piotrs@...ence.com>
Cc: Kazuhiro Kasai <kasai.kazuhiro@...ionext.com>,
Richard Weinberger <richard@....at>,
David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>,
Marek Vasut <marek.vasut@...il.com>,
Vignesh Raghavendra <vigneshr@...com>,
<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] mtd: rawnand: cadence: fix calculating avaialble
oob size
Hi Piotr,
Piotr Sroka <piotrs@...ence.com> wrote on Mon, 10 Feb 2020 10:55:26
+0100:
There is a typo in the title (available).
> Previously ecc_sector size was used for calculation but its value
> was not yet known.
Can we rework a little bit this? What about:
The value of cdns_chip->sector_count is not known at the moment
of the derivation of ecc_size, leading to a zero value. Fix
this by assigning ecc_size later in the code.
Also, I think it deserves a Fixes/Cc:stable tag!
>
> Signed-off-by: Piotr Sroka <piotrs@...ence.com>
> ---
> drivers/mtd/nand/raw/cadence-nand-controller.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/nand/raw/cadence-nand-controller.c b/drivers/mtd/nand/raw/cadence-nand-controller.c
> index 5063a8b493a4..2ebfd0934739 100644
> --- a/drivers/mtd/nand/raw/cadence-nand-controller.c
> +++ b/drivers/mtd/nand/raw/cadence-nand-controller.c
> @@ -2595,7 +2595,7 @@ int cadence_nand_attach_chip(struct nand_chip *chip)
> {
> struct cdns_nand_ctrl *cdns_ctrl = to_cdns_nand_ctrl(chip->controller);
> struct cdns_nand_chip *cdns_chip = to_cdns_nand_chip(chip);
> - u32 ecc_size = cdns_chip->sector_count * chip->ecc.bytes;
> + u32 ecc_size;
> struct mtd_info *mtd = nand_to_mtd(chip);
> int ret;
>
> @@ -2634,6 +2634,7 @@ int cadence_nand_attach_chip(struct nand_chip *chip)
> /* Error correction configuration. */
> cdns_chip->sector_size = chip->ecc.size;
> cdns_chip->sector_count = mtd->writesize / cdns_chip->sector_size;
> + ecc_size = cdns_chip->sector_count * chip->ecc.bytes;
>
> cdns_chip->avail_oob_size = mtd->oobsize - ecc_size;
>
Thanks,
Miquèl
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