[PATCH v2] mtd: Fix refcounting with MTD_PARTITIONED_MASTER

[Miquel Raynal]

On Mon, 2023-07-31 at 09:09:03 UTC, Miquel Raynal wrote:
> The logic is way too convoluted, let's clean the kref_get/put section to
> clarify what this block does, hopefully solving the refcounting issue
> when using CONFIG_MTD_PARTITIONED_MASTER at the same time:
> - Iterate through all the parent mtd devices
> - Grab a reference over them all but the master
> - Only grab the master whith CONFIG_MTD_PARTITIONED_MASTER
> Same logic must apply in the put path, otherwise it would be broken.
> 
> Cc: Tomas Winkler <tomas.winkler at intel.com>
> Cc: Alexander Usyskin <alexander.usyskin at intel.com>
> Cc: Zhang Xiaoxu <zhangxiaoxu5 at huawei.com>
> Fixes: 19bfa9ebebb5 ("mtd: use refcount to prevent corruption")
> Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
> Tested-by: Alexander Usyskin <alexander.usyskin at intel.com>

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

Miquel