[PATCH] mtd: Fallback to ->_read/write_oob() when ->_read/write() is missing

[Brian Norris]

On Sun, Jun 11, 2017 at 10:42:55PM +0200, Boris Brezillon wrote:
> Some MTD sublayers/drivers are implementing ->_read/write_oob() and
> providing dummy wrappers for their ->_read/write() implementations.
> Let the core handle this case instead of duplicating the logic.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon at free-electrons.com>
> ---
> Note that the goldfish_nand driver (currently in staging) has not been
> updated because some the ops->len != mtd->writesize check done in
> goldfish_nand_read/write_oob() prevents us from using this function as
> a fallback for ->_read/write().
> 
> This behavior is buggy anyway, because the core expects drivers
> implementing ->_read_oob() to support reading more than ->writesize in
> a single call. Probably something we should fix.

Looks OK to me:

Acked-by: Brian Norris <computersforpeace at gmail.com>

This touches NAND drivers more than core MTD stuff, so feel free to take
it in your branch.