linux-kernel - Re: [PATCH v4 3/4] mtd: add ECC error accounting for each read request

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Message-Id: <20220921084057.733270-1-miquel.raynal@bootlin.com>
Date:   Wed, 21 Sep 2022 10:40:57 +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 3/4] mtd: add ECC error accounting for each read request

On Wed, 2022-06-29 at 12:57:36 UTC, =?utf-8?b?TWljaGHFgiBLxJlwaWXFhA==?= wrote:
> Extend struct mtd_req_stats with two new fields holding the number of
> corrected bitflips and uncorrectable errors detected during a read
> operation.  This is a prerequisite for ultimately passing those counters
> to user space, where they can be useful to applications for making
> better-informed choices about moving data around.
> 
> Unlike 'max_bitflips' (which is set - in a common code path - to the
> return value of a function called while the MTD device's mutex is held),
> these counters have to be maintained in each MTD driver which defines
> the '_read_oob' callback because the statistics need to be calculated
> while the MTD device's mutex is held.
> 
> 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