linux-kernel - Re: [PATCH v3 2/4] mtd: rawnand: Fix nand_choose_best

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Message-Id: <20211119183843.1402825-1-miquel.raynal@bootlin.com>
Date:   Fri, 19 Nov 2021 19:38:43 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Herve Codina <herve.codina@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 2/4] mtd: rawnand: Fix nand_choose_best_timings() on unsupported interface

On Fri, 2021-11-19 at 15:03:14 UTC, Herve Codina wrote:
> When the NV-DDR interface is not supported by the NAND chip,
> the value of onfi->nvddr_timing_modes is 0. In this case,
> the best_mode variable value in nand_choose_best_nvddr_timings()
> is -1. The last for-loop is skipped and the function returns an
> uninitialized value.
> If this returned value is 0, the nand_choose_best_sdr_timings()
> is not executed and no 'best timing' are set. This leads the host
> controller and the NAND chip working at default mode 0 timing
> even if a better timing can be used.
> 
> Fix this uninitialized returned value.
> 
> nand_choose_best_sdr_timings() is pretty similar to
> nand_choose_best_nvddr_timings(). Even if onfi->sdr_timing_modes
> should never be seen as 0, nand_choose_best_sdr_timings() returned
> value is fixed.
> 
> Fixes: a9ecc8c814e9 ("mtd: rawnand: Choose the best timings, NV-DDR included")
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>

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

Miquel