linux-kernel - Re: [PATCH v5 2/4] mtd: mtdconcat: don't use mtd

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Date:   Fri, 19 Nov 2021 19:35:46 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Sean Nyekjaer <sean@...nix.com>,
        Boris Brezillon <boris.brezillon@...labora.com>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/4] mtd: mtdconcat: don't use mtd_{suspend,resume}()

On Tue, 2021-11-02 at 11:02:02 UTC, Sean Nyekjaer wrote:
> From: Boris Brezillon <boris.brezillon@...labora.com>
> 
> The MTD suspend logic will soon be adjusted to automatically wait for
> device wake-up before issuing IOs. In order to do that a new read-write
> lock will be added and taken in write-mode in the
> mtd_{suspend,resume}() path. Since mtdconcat.c itself is an MTD device,
> calling mtd_suspend/resume() on subdevices from the mtdconcat
> ->_{suspend,resume}() hook will lead to a nested lock, which lockdep
> will complain about if we don't add a proper annotation. Let's keep
> things simple and replace those mtd_{suspend,resume}(subdev) calls by
> subdev->_{suspend,resume}() ones to avoid this situation.
> 
> Tested-by: Sean Nyekjaer <sean@...nix.com>
> Signed-off-by: Boris Brezillon <boris.brezillon@...labora.com>
> Signed-off-by: Sean Nyekjaer <sean@...nix.com>

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

Miquel