linux-kernel - Re: [PATCH 0/2] mtd: nand: fix regression introduced by splitting off manufacturer dependent code

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Message-ID: <20170831131836.777aa652@bbrezillon>
Date:   Thu, 31 Aug 2017 13:18:36 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Lothar Waßmann <LW@...O-electronics.de>
Cc:     Brian Norris <computersforpeace@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        David Woodhouse <dwmw2@...radead.org>,
        Marek Vasut <marek.vasut@...il.com>,
        Richard Weinberger <richard@....at>,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH 0/2] mtd: nand: fix regression introduced by splitting
 off manufacturer dependent code

On Tue, 29 Aug 2017 12:17:11 +0200
Lothar Waßmann <LW@...O-electronics.de> wrote:

> commit c51d0ac59f24 ("mtd: nand: Move Samsung specific init/detection
> logic in nand_samsung.c") introduced a regression for Samsung SLC NAND
> chips by skipping the initialization of chip->bits_per_cell that is
> done in nand_decode_ext_id() from which the manufacturer dependent
> code was extracted.
> The regression should also affect Hynix and Macronix chips whose code
> was separated out in further commits but which I cannot test.
> AMD/Spansion and Toshiba NAND are not affected, since they are calling 
> nand_decode_ext_id() (which initializes bhip->bits_per_cell) in their
> .detect function.
> 
> Fix the regression and add a warning to nand_is_slc() to prevent
> further regressions of this kind.

Applied both to nand/next and generated a new PR to push this in 4.14.
Also added the Fixes and Cc-stable tag to the first patch.

Thanks,

Boris