Re: [PATCH v3 2/4] mtd: rawnand: Fix nand_choose_best_timings() on unsupported interface

[Miquel Raynal]

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@xxxxxxxxxxx>

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

Miquel