Date:   Tue, 23 Nov 2021 14:07:15 +0100
From:   Boris Brezillon <boris.brezillon@collabora.com>
To:     Sean Nyekjaer <sean@geanix.com>
Cc:     Marek Szyprowski <m.szyprowski@samsung.com>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>,
        Boris Brezillon <bbrezillon@kernel.org>,
        linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 3/4] mtd: core: protect access to MTD devices while
 in suspend
Message-ID: <20211123140715.280b2f70@collabora.com>
In-Reply-To: <20211123125012.ibzqu44ixmykbhkt@skn-laptop>
References: <20211102110204.3334609-1-sean@geanix.com>
        <20211102110204.3334609-4-sean@geanix.com>
        <CGME20211123120353eucas1p2fb2561b7cfddd8d6e7decaef8b504f4c@eucas1p2.samsung.com>
        <21092c0f-e11b-ac16-ab96-2a0556c0e30a@samsung.com>
        <20211123125012.ibzqu44ixmykbhkt@skn-laptop>
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On Tue, 23 Nov 2021 13:50:12 +0100
Sean Nyekjaer <sean@geanix.com> wrote:

> @Boris do we need to do something similar here to what we did with the
> mtdconcat stuff?

Absolutely, physmasp subdevices are never initialized/registered, so
you can't call any of the mtd helpers taking the suspend lock on those.
I guess it'd be better to call mtd_suspend/resume() on the concat device
in though:

static void physmap_flash_shutdown(struct platform_device *dev)
{
	struct physmap_flash_info *info = platform_get_drvdata(dev);

	mtd_suspend(info->cmtd);
}