linux-kernel - Re: [PATCH v2 2/2] mtd: mtdconcat: Check _read, _write callbacks existence before assignment

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Message-Id: <20210817164912.108616-1-miquel.raynal@bootlin.com>
Date:   Tue, 17 Aug 2021 18:49:12 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Zhihao Cheng <chengzhihao1@...wei.com>, miquel.raynal@...tlin.com,
        richard@....at, vigneshr@...com, bbrezillon@...nel.org
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com
Subject: Re: [PATCH v2 2/2] mtd: mtdconcat: Check _read, _write callbacks existence before assignment

On Tue, 2021-08-17 at 11:48:57 UTC, Zhihao Cheng wrote:
> Since 2431c4f5b46c3 ("mtd: Implement mtd_{read,write}() as wrappers
> around mtd_{read,write}_oob()") don't allow _write|_read and
> _write_oob|_read_oob existing at the same time, we should check the
> existence of callbacks "_read and _write" from subdev's master device
> (We can trust master device since it has been registered) before
> assigning, otherwise following warning occurs while making
> concatenated device:
> 
>   WARNING: CPU: 2 PID: 6728 at drivers/mtd/mtdcore.c:595
>   add_mtd_device+0x7f/0x7b0
> 
> Fixes: 2431c4f5b46c3 ("mtd: Implement mtd_{read,write}() around ...")
> Signed-off-by: Zhihao Cheng <chengzhihao1@...wei.com>

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

Miquel