linux-kernel - Re: [PATCH 10/12] mtd: nand: read ECC algorithm from the new field

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Date:	Sun, 17 Apr 2016 18:50:05 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	Rafał Miłecki <zajec5@...il.com>
Cc:	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	Richard Weinberger <richard@....at>,
	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 10/12] mtd: nand: read ECC algorithm from the new field

On Sun, 17 Apr 2016 18:27:40 +0200
Rafał Miłecki <zajec5@...il.com> wrote:

> On 16 April 2016 at 09:58, Boris Brezillon
> <boris.brezillon@...e-electrons.com> wrote:
> > On Fri, 15 Apr 2016 21:54:10 +0200
> > Rafał Miłecki <zajec5@...il.com> wrote:
> >
> >> Now we have all drivers properly setting this new field we can start
> >> using it and proceed with deprecating NAND_ECC_SOFT_BCH.
> >>
> >> Signed-off-by: Rafał Miłecki <zajec5@...il.com>
> >> ---
> >>  drivers/mtd/nand/nand_base.c | 98 ++++++++++++++++++++++++--------------------
> >>  1 file changed, 53 insertions(+), 45 deletions(-)
> >>
> >> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> >> index e1f3cf8..ffd1b32 100644
> >> --- a/drivers/mtd/nand/nand_base.c
> >> +++ b/drivers/mtd/nand/nand_base.c
> >> @@ -4154,7 +4154,7 @@ int nand_scan_tail(struct mtd_info *mtd)
> >>       /*
> >>        * If no default placement scheme is given, select an appropriate one.
> >>        */
> >> -     if (!mtd->ooblayout && (ecc->mode != NAND_ECC_SOFT_BCH)) {
> >> +     if (!mtd->ooblayout && ecc->algo != NAND_ECC_BCH) {
> >
> > Should be:
> >
> >         if (!mtd->ooblayout && ecc->algo == NAND_ECC_SOFT &&
> >             ecc->algo != NAND_ECC_BCH) {
> >
> > Otherwise you're also taking the NAND_ECC_HW + NAND_ECC_BCH into
> > account.
> 
> Pretty much yes, but without
> [PATCH 11/12] of: mtd: drop support for NAND_ECC_SOFT_BCH as "soft_bch" mapping
> we may be getting NAND_ECC_SOFT as well as NAND_ECC_SOFT_BCH. And
> 11/12 can't be applied before 10/12. We'll need to support both values
> for this very short moment (after 10/12 but before 11/12).


Why can't you move patch 11 before patch 10. The DT parsing code has
already been patched to set both ecc->algo to NAND_ECC_BCH and
ecc->mode to NAND_ECC_SOFT, so, to it seems perfectly safe to reorder
those changes to me (and change the test as suggested).

Am I missing something?

-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com