[PATCH] mtd: spi-nor: Fix divide by zero for spi-nor-generic flashes

[Miquel Raynal]

On Thu, 2023-05-18 at 08:54:40 UTC, Tudor Ambarus wrote:
> We failed to initialize n_banks for spi-nor-generic flashes, which
> caused a devide by zero when computing the bank_size.
> 
> By default we consider that all chips have a single bank. Initialize
> the default number of banks for spi-nor-generic flashes. Even if the
> bug is fixed with this simple initialization, check the n_banks value
> before dividing so that we make sure this kind of bug won't occur again
> if some other struct instance is created uninitialized.
> 
> Suggested-by: Todd Brandt <todd.e.brandt at linux.intel.com>
> Reported-by: Todd Brandt <todd.e.brandt at linux.intel.com>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217448
> Fixes: 9d6c5d64f028 ("mtd: spi-nor: Introduce the concept of bank")
> Link: https://lore.kernel.org/all/20230516225108.29194-1-todd.e.brandt@intel.com/
> Signed-off-by: Tudor Ambarus <tudor.ambarus at linaro.org>
> Tested-by: Todd Brandt <todd.e.brandt at linux.intel.com>
> Reviewed-by: Miquel Raynal <miquel.raynal at bootlin.com>

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

Miquel