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Date:   Tue, 20 Nov 2018 13:08:59 +0100
From:   Boris Brezillon <boris.brezillon@bootlin.com>
To:     Krzysztof Kozlowski <krzk@kernel.org>
Cc:     miquel.raynal@bootlin.com, jmkrzyszt@gmail.com,
        Stefan Agner <stefan@agner.ch>, richard@nod.at,
        dwmw2@infradead.org, computersforpeace@gmail.com,
        marek.vasut@gmail.com, linux-mtd@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: Re: [BUG BISECT] Missing MTD NAND partitions - mtd: rawnand: Move
 the ->exec_op() method to nand_controller_ops
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On Tue, 20 Nov 2018 12:48:46 +0100
Krzysztof Kozlowski <krzk@kernel.org> wrote:

> On Tue, 20 Nov 2018 at 11:33, Miquel Raynal <miquel.raynal@bootlin.com> wrote:
> >
> > Hi Krzysztof,
> >
> > Krzysztof Kozłowski <k.kozlowski.k@gmail.com> wrote on Tue, 20 Nov 2018
> > 10:46:33 +0100:
> >  
> > > Hi all,
> > >
> > > Since few days linux-next has problem on Freescale VF500 - MTD seems
> > > to be broken.
> > >
> > > Bisect pointed me to commit 7c27338c728e39ef47c83d101959aa332506969d
> > > ("mtd: rawnand: Move the ->exec_op() method to nand_controller_ops")
> > > as reason of failure to find MTD partitions.
> > >
> > > Toradex Colibri VF50 on Iris board (ARMv7, UP, Cortext-A5, NXP VF500,
> > > 128 MB RAM, 128 MB NAND, Systemd: v232) booted from NFS root (NFSv4)
> > > trying to mount UBIFS from NAND/MTD. Board uses VF610 NAND driver.
> > >
> > > The MTD partitions are missing entirely (nothing under /dev/mtd).
> > > In the logs you can also see:
> > > [    1.232161] UBI error: cannot open mtd ubi2, error -2
> > >
> > > Attached - dmesg.log
> > >
> > > Let me know if you need defconfig or any other information.  
> >
> > Thank you very much for testing and reporting the bug!
> >
> > Could you please test with this diff applied [1] please? We discussed
> > with Boris and we think it should fix your setup (and all others also
> > impacted).
> >
> > [1] http://code.bulix.org/r1m99i-509201  
> 
> error: patch failed: drivers/mtd/nand/raw/nand_base.c:4399
> error: drivers/mtd/nand/raw/nand_base.c: patch does not apply
> 
> Maybe you have a git tree with this somewhere?

Yep: https://github.com/bbrezillon/linux/tree/nand/next-fix