[PATCH v2 2/2] mtd: rawnand: Bypass a couple of sanity checks during NAND identification

[Miquel Raynal]

On Thu, 2024-05-16 at 13:13:20 UTC, Miquel Raynal wrote:
> Early during NAND identification, mtd_info fields have not yet been
> initialized (namely, writesize and oobsize) and thus cannot be used for
> sanity checks yet. Of course if there is a misuse of
> nand_change_read_column_op() so early we won't be warned, but there is
> anyway no actual check to perform at this stage as we do not yet know
> the NAND geometry.
> 
> So, if the fields are empty, especially mtd->writesize which is *always*
> set quite rapidly after identification, let's skip the sanity checks.
> 
> nand_change_read_column_op() is subject to be used early for ONFI/JEDEC
> identification in the very unlikely case of:
> - bitflips appearing in the parameter page,
> - the controller driver not supporting simple DATA_IN cycles.
> 
> As nand_change_read_column_op() uses nand_fill_column_cycles() the logic
> explaind above also applies in this secondary helper.
> 
> Fixes: c27842e7e11f ("mtd: rawnand: onfi: Adapt the parameter page read to constraint controllers")
> Fixes: daca31765e8b ("mtd: rawnand: jedec: Adapt the parameter page read to constraint controllers")
> Cc: stable at vger.kernel.org
> Reported-by: Alexander Dahl <ada at thorsis.com>
> Closes: https://lore.kernel.org/linux-mtd/20240306-shaky-bunion-d28b65ea97d7@thorsis.com/
> Reported-by: Steven Seeger <steven.seeger at flightsystems.net>
> Closes: https://lore.kernel.org/linux-mtd/DM6PR05MB4506554457CF95191A670BDEF7062@DM6PR05MB4506.namprd05.prod.outlook.com/
> Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
> Tested-by: Sascha Hauer <s.hauer at pengutronix.de>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git mtd/fixes.

Miquel