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Date: Thu, 31 Aug 2017 13:18:36 +0200
From: Boris Brezillon <boris.brezillon@free-electrons.com>
To: Lothar =?UTF-8?B?V2HDn21hbm4=?= <LW@KARO-electronics.de>
Cc: Brian Norris <computersforpeace@gmail.com>,
        Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>,
        David Woodhouse <dwmw2@infradead.org>,
        Marek Vasut <marek.vasut@gmail.com>,
        Richard Weinberger <richard@nod.at>, linux-kernel@vger.kernel.org,
        linux-mtd@lists.infradead.org
Subject: Re: [PATCH 0/2] mtd: nand: fix regression introduced by splitting
 off manufacturer dependent code
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On Tue, 29 Aug 2017 12:17:11 +0200
Lothar Waßmann <LW@KARO-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