linux-kernel - Re: [PATCH v4 1/4] mtd: track maximum number of bitflips for each read request

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Message-Id: <20220921084120.733357-1-miquel.raynal@bootlin.com>
Date:   Wed, 21 Sep 2022 10:41:20 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Michał Kępień <kernel@...pniu.pl>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     Boris Brezillon <boris.brezillon@...labora.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/4] mtd: track maximum number of bitflips for each read request

On Wed, 2022-06-29 at 12:57:34 UTC, =?utf-8?b?TWljaGHFgiBLxJlwaWXFhA==?= wrote:
> mtd_read_oob() callers are currently oblivious to the details of ECC
> errors detected during the read operation - they only learn (through the
> return value) whether any corrected bitflips or uncorrectable errors
> occurred.  More detailed ECC information can be useful to user-space
> applications for making better-informed choices about moving data
> around.
> 
> Extend struct mtd_oob_ops with a pointer to a newly-introduced struct
> mtd_req_stats and set its 'max_bitflips' field to the maximum number of
> bitflips found in a single ECC step during the read operation performed
> by mtd_read_oob().  This is a prerequisite for ultimately passing that
> value back to user space.
> 
> Suggested-by: Boris Brezillon <boris.brezillon@...labora.com>
> Signed-off-by: Michał Kępień <kernel@...pniu.pl>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/next, thanks.

Miquel